PATENT ABSTRACT
The present invention relates to peptide ligands of the melanocortin receptors, in particular the melancortin-4 receptor, and as such, are useful in the treatment of disorders responsive to the activation of this receptor, such as insulin resistance.

PATENT DESCRIPTION
This application is a continuation application of pending U.S. Ser. No. 12/740,917, filed May 17, 2010, which is a United States national filing under 35 U.S.C. §371 of international (PCT) application No. PCT/US2008/012490, filed Nov. 5, 2008 and designating the US, which claims priority to U.S. provisional application No. 61/001,933, filed Nov. 5, 2007, each of which is hereby incorporated by reference in its entirety. 
    
    
     SEQUENCE LISTING 
     The instant application contains a Sequence Listing which has been submitted in ASCII format via EFS-Web, and is hereby incorporated by reference in its entirety. The ASCII copy, is named “183P_PCT2_US-A_SeqListing_01_05 May_2015 ST25.txt”, created on May 1, 2015, and has the file size of 234,000 bytes. 
     BACKGROUND OF THE INVENTION 
     Melanocortins are a family of regulatory peptides which are formed by post-translational processing of pro-hormone pro-opiomelanocortin (POMC; 131 amino acids in length). POMC is processed into three classes of hormones; the melanocortins, adrenocorticotropin hormone, and various endorphins (e.g. lipotropin) (Cone et al., Recent Prog. Horm. Res., 51:287-317, (1996); Cone et al., Ann. N.Y. Acad. Sci., 31:342-363, (1993)). 
     Five melanocortin receptors (MC-R) have been characterized to date. These include melanocyte-specific receptor (MC1-R), corticoadrenal-specific ACTH receptor (MC2-R), melacortin-3 (MC3-R), melanocortin-4 (MC4-R) and melanocortin-5 receptor (MC5-R). All of the melanocortin receptors respond to the peptide hormone class of melanocyte stimulating hormones (MSH) (Cone et al., Ann. N.Y. Acad. Sci., 680:342-363 (1993); Cone et al., Recent Prog. Horm. Res., 51:287-318 (1996)). 
     There has been great interest in melanocortin (MC-R) receptors as targets for the design of novel therapeutics to treat disorders of body weight such as obesity and cachexia. One of the receptors, MC4-R, is a 332 amino acid transmembrane protein expressed in brain as well as placental and gut tissues (Cone et al., Ann. N.Y. Acad. Sci., 680:342-363 (1993); Cone et al., Recent Prog. Horm. Res., 51:287-318 (1996)). Recent pharmacological confirmation has established that central MC4-R receptors are the prime mediators of the anorexic and orexigenic effects reported for melanocortin agonists and antagonists, respectively (Giraudo et al., Brain Res., 809:302-306 (1998); Farooqi et al., NE J Med., 348:1085-1095 (2003); MacNeil et al., Eu. J. Pharm., 44:141-157 (2002); MacNeil et al., Eu. J. Pharm., 450:93-109 (2002); Kask et al., NeuroReport, 10:707-711 (1999); Chen et al., Transgenic Res., 9:145-54, (2000); Marsh et al., Nat Genet., 21:119-22, (1999); Balthasar et al., Cell, 123:493-505 (2005)). 
     Complications of body weight disorders commonly include an inability to produce and utilize insulin, often resulting in faulty glucose regulation. The consequence of failure to properly control glucose metabolism affects many aspects of overall health including energy metabolism, neuropathy and heart disease. Current progress with receptor-selective melanocortin receptor ligands evidences the therapeutic potential of melanocortin receptor activation, particularly MC4-R, in the treatment of glucose regulation, including insulin metabolism. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to the use of peptides which are ligands of one or more of the melanocortin receptors (MC-R), or the pharmaceutically-acceptable salts thereof, to treat mammals suffering from insulin resistance. In one embodiment, the ligands are agonists to the melanocortin 4 receptor. In a preferred embodiment, the melanocortin receptor ligands are according to the formulae described herein or are selected from particular peptides described herein. 
     The insulin resistant subject mammals may be obese or overweight and may lose weight as a result of the administration of the peptides of the invention. The insulin resistant subject mammals may also be normal weight or lean. The insulin resistant condition of the subject mammals may be treated independent of weight loss. In addition, the subject mammals may be human subjects of any age, such as an infant, a child, an adult or an elderly adult. 
     In the first embodiment, the invention provides a method to treat insulin resistance in a mammalian subject, with or without weight loss, by the administration of a therapeutically effective amount of a melanocortin receptor 4 ligand according to Formula (I) and pharmaceutically acceptable salts, hydrates, solvates or prodrugs thereof (see International Patent Application Publication Number WO 2007/008704, incorporated herein by reference in its entirety):
 
(R 2 R 3 )-A 1 - c (A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 )-A 10 -R 1   (I)
 
wherein:
 
     A 1  is Acc, HN—(CH 2 ) m —C(O), L- or D-amino acid, or deleted; 
     A 2  is Cys, D-Cys, hCys, D-hCys, Pen, D-Pen, Asp, or Glu; 
     A 3  is Gly, Ala, β-Ala, Gaba, Aib, D-amino acid, or deleted; 
     A 4  is His, 2-Pal, 3-Pal, 4-Pal, Taz, 2-Thi, 3-Thi, or (X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe; 
     A 5  is D-Phe, D-1-Nal, D-2-Nal, D-Trp, D-Bal, D-(X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe, L-Phe or D-(Et)Tyr; 
     A 6  is Arg, hArg, Dab, Dap, Lys, Orn, or HN—CH((CH 2 ) n —N(R 4 R 5 ))—C(O); 
     A 7  is Trp, 1-Nal, 2-Nal, Bal, Bip, D-Trp, D-1-Nal, D-2-Nal, D-Bal or D-Bip; 
     A 8  is Gly, D-Ala, Acc, Ala, β-Ala, Gaba, Apn, Ahx, Aha, HN—(CH 2 ) s —C(O), or deleted; 
     A 9  is Cys, D-Cys, hCys, D-hCys, Pen, D-Pen, Dab, Dap, Orn, or Lys; 
     A 10  is Acc, HN—(CH 2 ) t —C(O), L- or D-amino acid, or deleted; 
     R 1  is OH or NH 2 ; 
     each of R 2  and R 3  is, independently for each occurrence, selected from the group consisting of H, (C 1 -C 30 )alkyl, (C 1 -C 30 )heteroalkyl, (C 1 -C 30 )acyl, (C 2 -C 30 )alkenyl, (C 2 -C 30 ) alkynyl, aryl(C 1 -C 30 )alkyl, aryl(C 1 -C 30 )acyl, substituted (C 1 -C 30 )alkyl, substituted (C 1 -C 30 ) heteroalkyl, substituted (C 1 -C 30 )acyl, substituted (C 2 -C 30 )alkenyl, substituted (C 2 -C 30 ) alkynyl, substituted aryl(C 1 -C 30 )alkyl, and substituted aryl(C 1 -C 30 )acyl; 
     each of R 4  and R 5  is, independently for each occurrence, H, (C 1 -C 40 )alkyl, (C 1 -C 40 ) heteroalkyl, (C 1 -C 40 )acyl, (C 2 -C 40 )alkenyl, (C 2 -C 40 )alkynyl, aryl(C 1 -C 40 )alkyl, aryl(C 1 -C 40 ) acyl, substituted (C 1 -C 40 )alkyl, substituted (C 1 -C 40 )heteroalkyl, substituted (C 1 -C 40 ) acyl, substituted (C 2 -C 40 )alkenyl, substituted (C 2 -C 40 )alkynyl, substituted aryl(C 1 -C 40 ) alkyl, substituted aryl(C 1 -C 40 )acyl, (C 1 -C 40 )alkylsulfonyl, or —C(NH)—NH 2 ; 
     m is, independently for each occurrence, 1, 2, 3, 4, 5, 6 or 7; 
     n is, independently for each occurrence, 1, 2, 3, 4 or 5; 
     s is, independently for each occurrence, 1, 2, 3, 4, 5, 6, or 7; 
     t is, independently for each occurrence, 1, 2, 3, 4, 5, 6, or 7; 
     X 1 , X 2 , X 3 , X 4 , and X 5  each is, independently for each occurrence, H, F, Cl, Br, I, (C 1-10 )alkyl, substituted (C 1-10 )alkyl, (C 2-10 )alkenyl, substituted (C 2-10 )alkenyl, (C 2-10 )alkynyl, substituted (C 2-10 )alkynyl, aryl, substituted aryl, OH, NH 2 , NO 2 , or CN; provided that 
     (I). when R 4  is (C 1 -C 40 )acyl, aryl(C 1 -C 40 )acyl, substituted (C 1 -C 40 )acyl, substituted aryl(C 1 -C 40 )acyl, (C 1 -C 40 )alkylsulfonyl, or —C(NH)—NH 2 , then R 5  is H or (C 1 -C 40 )alkyl, (C 1 -C 40 )heteroalkyl, (C 2 -C 40 )alkenyl, (C 2 -C 40 )alkynyl, aryl(C 1 -C 40 ) alkyl, substituted (C 1 -C 40 )alkyl, substituted (C 1 -C 40 )heteroalkyl, substituted (C 2 -C 40 )alkenyl, substituted (C 2 -C 40 )alkynyl, or substituted aryl(C 1 -C 40 ) alkyl; 
     (II). when R 2  is (C 1 -C 30 )acyl, aryl(C 1 -C 30 )acyl, substituted (C 1 -C 30 )acyl, or substituted aryl(C 1 -C 30 )acyl, then R 3  is H, (C 1 -C 30 )alkyl, (C 1 -C 30 )heteroalkyl, (C 2 -C 30 )alkenyl, (C 2 -C 30 )alkynyl, aryl(C 1 -C 30 )alkyl, substituted (C 1 -C 30 )alkyl, substituted (C 1 -C 30 )heteroalkyl, substituted (C 2 -C 30 )alkenyl, substituted (C 2 -C 30 ) alkynyl, or substituted aryl(C 1 -C 30 )alkyl; 
     (III). either A 3  or A 8  or both must be present in said compound; 
     (IV). when A 2  is Cys, D-Cys, hCys, D-hCys, Pen, or D-Pen, then A 9  is Cys, D-Cys, hCys, D-hCys, Pen, or D-Pen; 
     (V). when A 2  is Asp or Glu, then A 9  is Dab, Dap, Orn, or Lys; 
     (VI). when A 8  is Ala or Gly, then A 1  is not Nle; and 
     (VII). when A 1  is deleted, then R 2  and R 3  cannot both be H; or pharmaceutically acceptable salts thereof. 
     In one aspect of the first embodiment, the invention provides a method to treat insulin resistance in a mammalian subject, with or without weight loss, by the administration of a therapeutically effective amount of a subgroup of melanocortin receptor ligands of the immediate foregoing Formula I, wherein: 
     A 1  is A6c, Arg, D-Arg, Cha, D-Cha, hCha, Chg, D-Chg, Gaba, Ile, Leu, hLeu, Met, β-hMet, 2-Nal, D-2-Nal, Nip, Nle, Oic, Phe, D-Phe, hPhe, hPro, Val, or deleted; 
     A 2  is Asp, Cys, D-Cys, hCys, D-hCys, Glu, Pen, or D-Pen; 
     A 3  is D-Abu, Aib, Ala, β-Ala, D-Ala, D-Cha, Gaba, D-Glu, Gly, D-Ile, D-Leu, D-Tle, D-Val, or deleted; 
     A 4  is His or 3-Pal; 
     A 5  is D-Bal, D-1-Nal, D-2-Nal, D-Phe, D-Trp, or D-(Et)Tyr; 
     A 6  is Arg, or hArg; 
     A 7  is Bal, Bip, 1-Nal, 2-Nal, Trp, D-Trp; 
     A 8  is A6c, D-Ala, Aha, Ahx, Ala, β-Ala, Apn, Gaba, Gly or deleted; 
     A 9  is Cys, D-Cys, hCys, D-hCys, Lys, Pen, or D-Pen; 
     A 10  is Thr, or deleted; 
     wherein at least one of A 3  or A 8  is deleted, but not both, 
     or pharmaceutically acceptable salts thereof. 
     More preferred compounds of the immediately foregoing group of ligands according to Formula (I) useful to treat insulin resistance in a mammalian subject, with or without weight loss, are compounds of the formula: 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               SEQ ID NO: 1            Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-β-Ala-Lys)-NH 2 ;                    SEQ ID NO: 1            Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-A6c-Lys)-NH 2 ;                    SEQ ID NO: 2            Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Ahx-Cys)-NH 2 ;                    SEQ ID NO: 3            D-Phe-c(Cys-His-D-Phe-Arg-Trp-Ala-D-Cys)-Thr-               NH 2 ;                    SEQ ID NO: 3            D-Phe-c(Cys-His-D-Phe-Arg-Trp-β-Ala-D-Cys)-Thr-               NH 2 ;                    SEQ ID NO: 3            D-Phe-c(Cys-His-D-Phe-Arg-Trp-Gaba-D-Cys)-Thr-NH 2 ;                    SEQ ID NO: 2            Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-NH 2 ;                    SEQ ID NO: 4            Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Apn-Lys)-NH 2 ;                    SEQ ID NO: 5            Ac-A6c-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 6            Ac-D-2-Nal-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 6            Ac-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 6            Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 7            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 7            Ac-Nle-c(Cys-β-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 7            Ac-Nle-c(Cys-Gaba-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 7            Ac-Nle-c(Cys-Aib-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 7            Ac-Nle-c(Cys-Gly-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 8            Ac-Nle-c(D-Cys-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 8            Ac-Nle-c(D-Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 8            Ac-Nle-c(D-Cys-β-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 8            Ac-Nle-c(D-Cys-Gaba-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 8            Ac-Nle-c(D-Cys-Aib-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 8            Ac-Nle-c(D-Cys-Gly-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 9            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                    SEQ ID NO: 9            Ac-Nle-c(Cys-β-Ala-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                    SEQ ID NO: 9            Ac-Nle-c(Cys-Gaba-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                    SEQ ID NO: 9            Ac-Nle-c(Cys-Aib-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                    SEQ ID NO: 9            Ac-Nle-c(Cys-Gly-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                    SEQ ID NO: 10            Ac-Nle-c(D-Cys-Ala-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                    SEQ ID NO: 10            Ac-Nle-c(D-Cys-D-Ala-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                    SEQ ID NO: 10            Ac-Nle-c(D-Cys-β-Ala-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                    SEQ ID NO: 10            Ac-Nle-c(D-Cys-Gaba-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                    SEQ ID NO: 10            Ac-Nle-c(D-Cys-Aib-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                    SEQ ID NO: 11            Ac-Oic-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-D-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-Nip-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-hPro-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-hLeu-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-Phe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-D-Phe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-D-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 12            n-butanoyl-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-               NH 2 ;                    SEQ ID NO: 11            Ac-hPhe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-β-hMet-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-Gaba-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 13            Ac-Cha-c(Asp-His-D-Phe-Arg-D-Trp-Ala-Lys)-NH 2 ;                    SEQ ID NO: 13            Ac-hCha-c(Asp-His-D-Phe-Arg-D-Trp-Ala-Lys)-NH 2 ;                    SEQ ID NO: 13            Ac-Leu-c(Asp-His-D-Phe-Arg-D-Trp-Ala-Lys)-NH 2 ;                    SEQ ID NO: 13            Ac-hLeu-c(Asp-His-D-Phe-Arg-D-Trp-Ala-Lys)-NH 2 ;                    SEQ ID NO: 13            Ac-Phe-c(Asp-His-D-Phe-Arg-D-Trp-Ala-Lys)-NH 2 ;                    SEQ ID NO: 14            Ac-Nle-c(Asp-His-D-Phe-Arg-D-Trp-D-Ala-Lys)-NH 2 ;                    SEQ ID NO: 14            Ac-Nle-c(Asp-His-D-Phe-Arg-D-Trp-β-Ala-Lys)-NH 2 ;                    SEQ ID NO: 14            Ac-Nle-c(Asp-His-D-Phe-Arg-D-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 14            Ac-Nle-c(Asp-His-D-Phe-Arg-D-Trp-Aha-Lys)-NH 2 ;                    SEQ ID NO: 14            Ac-Nle-c(Asp-His-D-Phe-Arg-D-Trp-Apn-Lys)-NH 2 ;                    SEQ ID NO: 15            Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Apn-Cys)-NH 2 ;                    SEQ ID NO: 15            Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 15            Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Ahx-Cys)-NH 2 ;                    SEQ ID NO: 15            Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-β-Ala-Cys)-NH 2 ;                    SEQ ID NO: 15            Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-D-Ala-Cys)-NH 2 ;                    SEQ ID NO: 16            Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 16            Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-2-Nal-Cys)-NH 2 ;                    SEQ ID NO: 16            Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-1-Nal-Cys)-NH 2 ;                    SEQ ID NO: 17            n-butanoyl-Nle-c(Cys-D-Ala-His-D-Phe-Arg-2-Nal-               Cys)-NH 2 ;                    SEQ ID NO: 17            n-butanoyl-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-               NH 2 ;                    SEQ ID NO: 18            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-2-Nal-Cys)-NH 2 ;                    SEQ ID NO: 18            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-1-Nal-Cys)-NH 2 ;                    SEQ ID NO: 18            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Bal-Cys)-NH 2 ;                    SEQ ID NO: 61            Ac-Nle-c(Cys-D-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 19            Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-D-Ala-Lys)-NH 2 ;                    SEQ ID NO: 20            Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-Bal-Cys)-NH 2 ;                    SEQ ID NO: 21            Ac-Nle-c(Pen-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 22            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-NH 2 ;                    SEQ ID NO: 22            Ac-Nle-c(Pen-D-Ala-His-D-Phe-Arg-Trp-Pen)-NH 2 ;                    SEQ ID NO: 23            D-Phe-c(Cys-His-D-Phe-hArg-Trp-β-Ala-D-Cys)-Thr-               NH 2 ;                    SEQ ID NO: 24            D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-               Thr-NH 2 ;                    SEQ ID NO: 25            D-Phe-c(Cys-His-D-Phe-Arg-Bip-β-Ala-D-Cys)-Thr-               NH 2 ;                    SEQ ID NO: 24            D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-               Thr-NH 2 ;                    SEQ ID NO: 26            D-Phe-c(Cys-His-D-Phe-hArg-Bip-β-Ala-D-Cys)-               Thr-NH 2 ;                    SEQ ID NO: 26            D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-               Cys)-Thr-NH 2 ;                    SEQ ID NO: 27            Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-NH 2 ;                    SEQ ID NO: 28            Ac-Nle-c(Asp-D-Ala-His-D-Phe-Arg-Trp-Lys)-NH 2 ;                    SEQ ID NO: 28            Ac-Nle-c(Asp-D-Ala-His-D-Phe-Arg-Bal-Lys)-NH 2 ;                    SEQ ID NO: 29            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-OH;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Abu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Val-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Ile-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Tle-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 31            Ac-Nle-c(Pen-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 32            Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Pen)-NH 2 ;                    SEQ ID NO: 32            Ac-Nle-c(Pen-His-D-Phe-Arg-Trp-Gaba-Pen)-NH 2 ;                    SEQ ID NO: 33            Ac-Leu-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 33            Ac-Cha-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 33            Ac-Ile-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 33            Ac-Phe-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 33            Ac-Val-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 33            Ac-2-Nal-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 34            Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 34            Phe-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 35            Ac-Nle-c(Cys-3-Pal-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 36            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-OH;                    SEQ ID NO: 37            Ac-Nle-c(Cys-His-Phe-Arg-D-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 38            Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Ala-Lys)-NH 2 ;                    SEQ ID NO: 38            Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-β-Ala-Lys)-NH 2 ;                    SEQ ID NO: 39            Ac-Nle-c(Cys-His-D-2-Nal-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 39            Ac-Nle-c(Cys-His-D-2-Nal-Arg-Trp-Ahx-Cys)-NH 2 ;                    SEQ ID NO: 40            Ac-hPhe-c(Asp-His-D-2-Nal-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 40            Ac-Cha-c(Asp-His-D-2-Nal-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 41            Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-β-Ala-Lys)-OH;                    SEQ ID NO: 42            Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Ahx-Cys)-OH;                    SEQ ID NO: 43            D-Phe-c(Cys-His-D-Phe-Arg-Trp-Ala-D-Cys)-Thr-OH;                    SEQ ID NO: 43            D-Phe-c(Cys-His-D-Phe-Arg-Trp-β-Ala-D-Cys)-Thr-OH;                    SEQ ID NO: 43            D-Phe-c(Cys-His-D-Phe-Arg-Trp-Gaba-D-Cys)-Thr-OH;                    SEQ ID NO: 42            Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-OH;                    SEQ ID NO: 41            Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Apn-Lys)-OH;                    SEQ ID NO: 44            Ac-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                    SEQ ID NO: 44            Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                    SEQ ID NO: 29            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-OH;                    SEQ ID NO: 44            Ac-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                    SEQ ID NO: 44            Ac-D-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                    SEQ ID NO: 44            Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                    SEQ ID NO: 44            Ac-D-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                    SEQ ID NO: 44            Ac-hPhe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                    SEQ ID NO: 45            Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Gaba-Cys)-OH;                    SEQ ID NO: 45            Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Ahx-Cys)-OH;                    SEQ ID NO: 45            Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-β-Ala-Cys)-OH;                    SEQ ID NO: 45            Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-D-Ala-Cys)-OH;                    SEQ ID NO: 46            Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-OH;                    SEQ ID NO: 46            Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-2-Nal-Cys)-OH;                    SEQ ID NO: 46            Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-1-Nal-Cys)-OH;                    SEQ ID NO: 46            Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-Bal-Cys)-OH;                    SEQ ID NO: 47            Ac-Nle-c(Pen-D-Ala-His-D-Phe-Arg-Trp-Cys)-OH;                    SEQ ID NO: 29            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-OH;                    SEQ ID NO: 48            Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Pen)-OH;                    SEQ ID NO: 49            Ac-Arg-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 50            Ac-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 50            Ac-D-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 51            Ac-D-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-NH 2 ;                    SEQ ID NO: 52            Ac-D-Arg-c(Cys-His-D-Phe-Arg-Trp-Gaba-Pen)-NH 2 ;                    SEQ ID NO: 52            Ac-Arg-c(Cys-His-D-Phe-Arg-Trp-Gaba-Pen)-NH 2 ;                    SEQ ID NO: 51            Ac-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-NH 2 ;                    SEQ ID NO: 53            Ac-D-Arg-c(Asp-His-D-Phe-Arg-Trp-Ala-Lys)-NH 2 ;                    SEQ ID NO: 53            Ac-Arg-c(Asp-His-D-Phe-Arg-Trp-Ala-Lys)-NH 2 ;                    SEQ ID NO: 7            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 24            D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-               Thr-NH 2 ;                    SEQ ID NO: 27            Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-NH 2 ;                    SEQ ID NO: 32            Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Pen)-NH 2 ;                    SEQ ID NO: 34            Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 1            Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-β-Ala-Lys)-NH 2 ;                    SEQ ID NO: 2            Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Ahx-Cys)-NH 2 ;                    SEQ ID NO: 3            D-Phe-c(Cys-His-D-Phe-Arg-Trp-β-Ala-D-Cys)-Thr-               NH 2 ;                    SEQ ID NO: 3            D-Phe-c(Cys-His-D-Phe-Arg-Trp-Gaba-D-Cys)-Thr-NH 2 ;                    SEQ ID NO: 2            Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-NH 2 ;                    SEQ ID NO: 4            Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Apn-Lys)-NH 2 ;                    SEQ ID NO: 6            Ac-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 6            Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-D-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 11            Ac-hPhe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 15            Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-β-Ala-Cys)-NH 2 ;                    SEQ ID NO: 21            Ac-Nle-c(Pen-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 22            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-NH 2 ;                    SEQ ID NO: 23            D-Phe-c(Cys-His-D-Phe-hArg-Trp-β-Ala-D-Cys)-               Thr-NH 2 ;                    SEQ ID NO: 25            D-Phe-c(Cys-His-D-Phe-Arg-Bip-β-Ala-D-Cys)-               Thr-NH 2 ;                    SEQ ID NO: 24            D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-               Thr-NH 2 ;                    SEQ ID NO: 26            D-Phe-c(Cys-His-D-Phe-hArg-Bip-β-Ala-D-Cys)-Thr-               NH 2 ;                    SEQ ID NO: 26            D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-               Thr-NH 2 ;                    SEQ ID NO: 28            Ac-Nle-c(Asp-D-Ala-His-D-Phe-Arg-Trp-Lys)-NH 2 ;                    SEQ ID NO: 28            Ac-Nle-c(Asp-D-Ala-His-D-Phe-Arg-Bal-Lys)-NH 2 ;                    SEQ ID NO: 29            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-OH;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Abu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Val-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Ile-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Tle-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 30            Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 31            Ac-Nle-c(Pen-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 32            Ac-Nle-c(Pen-His-D-Phe-Arg-Trp-Gaba-Pen)-NH 2 ;                    SEQ ID NO: 33            Ac-Leu-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 33            Ac-Cha-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 33            Ac-Ile-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 33            Ac-Phe-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 33            Ac-Val-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 33            Ac-2-Nal-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 34            Phe-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 35            Ac-Nle-c(Cys-3-Pal-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 36            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-OH;                    SEQ ID NO: 37            Ac-Nle-c(Cys-His-Phe-Arg-D-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 16            Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                    SEQ ID NO: 16            Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-2-Nal-Cys)-NH 2 ;                    SEQ ID NO: 20            Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-Bal-Cys)-NH 2 ;                    SEQ ID NO: 38            Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Ala-Lys)-NH 2 ;                    SEQ ID NO: 38            Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-β-Ala-Lys)-NH 2 ;                    SEQ ID NO: 39            Ac-Nle-c(Cys-His-D-2-Nal-Arg-Trp-Gaba-Cys)-NH 2 ;                    SEQ ID NO: 39            Ac-Nle-c(Cys-His-D-2-Nal-Arg-Trp-Ahx-Cys)-NH 2 ;                    SEQ ID NO: 40            Ac-hPhe-c(Asp-His-D-2-Nal-Arg-Trp-Gaba-Lys)-NH 2 ;                    SEQ ID NO: 40            Ac-Cha-c(Asp-His-D-2-Nal-Arg-Trp-Gaba-Lys)-NH 2 ;       or                    SEQ ID NO: 49            Ac-Arg-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;            
or pharmaceutically acceptable salts thereof.
 
     In the second embodiment, the invention provides a method to treat insulin resistance in a mammalian subject, with or without weight loss, by the administration of a therapeutically effective amount of a melanocortin receptor ligand according to Formula (II) and pharmaceutically acceptable salts, hydrates, solvates or prodrugs thereof (see International Patent Application Publication Number WO 2007/008704 incorporated herein by reference in its entirety):
 
(R 2 R 3 )-A 1 - c (A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 )-NH 2   (II)
 
wherein:
 
     A 1  is Nle or deleted; 
     A 2  is Cys or Asp; 
     A 3  is Glu or D-Ala; 
     A 4  is His; 
     A 5  is D-Phe; 
     A 6  is Arg; 
     A 7  is Trp, 2-Nal or Bal; 
     A 8  is Gly, Ala, D-Ala, β-Ala, Gaba or Apn; 
     A 9  is Cys or Lys; 
     each of R 2  and R 3  is independently selected from the group consisting of H or (C 1 -C 6 )acyl; 
     provided that 
     (I). when R 2  is (C 1 -C 6 )acyl, then R 3  is H; and 
     (II). when A 2  is Cys, then A 9  is Cys, or a pharmaceutically acceptable salt thereof. 
     More preferred of the immediately foregoing group of compounds which are useful to treat insulin resistance in a mammalian subject, with or without weight loss, are compounds of the formula: 
                                                                                                                                                                           SEQ ID NO: 54            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Gly-Cys)-NH 2 ;                    SEQ ID NO: 54            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-D-Ala-Cys)-               NH 2 ;                    SEQ ID NO: 54            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-β-Ala-Cys)-               NH 2 ;                    SEQ ID NO: 54            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Gaba-Cys)-               NH 2 ;                    SEQ ID NO: 54            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Apn-Cys)-NH 2 ;                    SEQ ID NO: 55            Ac-c(Cys-Glu-His-D-Phe-Arg-Trp-Ala-Cys)-NH 2 ;                    SEQ ID NO: 55            Ac-c(Cys-Glu-His-D-Phe-Arg-2-Nal-Ala-Cys)-NH 2 ;                    SEQ ID NO: 56            Ac-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Ala-Cys)-NH 2 ;                    SEQ ID NO: 56            Ac-c(Cys-D-Ala-His-D-Phe-Arg-2-Nal-Ala-Cys)-NH 2 ;                    SEQ ID NO: 57            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Ala-Cys)-NH 2 ;                    SEQ ID NO: 57            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-β-Ala-Cys)-               NH 2 ;                    SEQ ID NO: 57            Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Gaba-Cys)-               NH 2 ;       or                    SEQ ID NO: 58            Ac-Nle-c(Asp-D-Ala-His-D-Phe-Arg-Bal-Ala-Lys)-NH 2 ;            
or a pharmaceutically acceptable salt thereof.
 
     In the third embodiment, the invention provides a method to treat insulin resistance in a mammalian subject, with or without weight loss, by the administration of a therapeutically effective amount of a melanocortin receptor compound according to Formula (III), and pharmaceutically acceptable salts, hydrates, solvates or prodrugs thereof (see International Application Publication Number WO 2007/008684, incorporated herein by reference in its entirety):
 
(R 2 R 3 )—B 1 -A 1 - c (A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 )-A 10 -A 11 -A 12 -A 13 -B 2 —B 3 —R 1    (III)
 
wherein:
 
     B 1  is a peptide moiety which contains 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 amino acids, wherein at least 5 amino acids are independently selected from the group consisting of L-Arg, D-Arg, L-hArg and D-hArg, or B 1  is optionally deleted; 
     A 1  is Acc, HN—(CH 2 ) m —C(O), L- or D-amino acid or deleted; 
     A 2  is Cys, D-Cys, hCys, D-hCys, Pen, D-Pen, Asp or Glu; 
     A 3  is Gly, Glu, Ala, β-Ala, Gaba, Aib, D-amino acid or deleted; 
     A 4  is His, 2-Pal, 3-Pal, 4-Pal, Taz, 2-Thi, 3-Thi or (X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe; 
     A 5  is D-Phe, D-1-Nal, D-2-Nal, D-Trp, D-Bal, D-(X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe, D-(Et)Tyr, D-Dip, D-Bip or D-Bpa; 
     A 6  is Arg, hArg, Dab, Dap, Lys, Orn or HN—CH((CH 2 ) n —N(R 4 R 5 ))—C(O); 
     A 7  is Trp, 1-Nal, 2-Nal, Bal, Bip, Dip, Bpa, D-Trp, D-1-Nal, D-2-Nal, D-Bal, D-Bip, D-Dip or D-Bpa; 
     A 8  is Gly, D-Ala, Acc, Ala, β-Ala, Gaba, Apn, Ahx, Aha, HN—(CH 2 ) s —C(O) or deleted; 
     A 9  is Cys, D-Cys, hCys, D-hCys, Pen, D-Pen, Dab, Dap, Orn or Lys; 
     A 10  is Acc, HN—(CH 2 ) t —C(O), Pro, hPro, 3-Hyp, 4-Hyp, Thr, an L- or D-amino acid or deleted; 
     A 11  is Pro, hPro, 3-Hyp, 4-Hyp or deleted; 
     A 12  is Lys, Dab, Dap, Arg, hArg or deleted; 
     A 13  is Asp, Glu or deleted; 
     B 2  is a peptide moiety containing 1, 2, 3, 4, or 5 amino acids or deleted, 
     B 3  is a peptide moiety which contains 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15 amino acids wherein at least 5 amino acids are independently selected from the group consisting of L-Arg, D-Arg, L-hArg and D-hArg, or is deleted; 
     R 1  is OH or NH 2 ; 
     R 2  and R 3  each is, independently for each occurrence, selected from the group consisting of H, (C 1 -C 30 )alkyl, (C 1 -C 30 )heteroalkyl, (C 1 -C 30 )acyl, (C 2 -C 30 )alkenyl, (C 2 -C 30 )alkynyl, aryl(C 1 -C 30 )alkyl, aryl(C 1 -C 30 )acyl, substituted (C 1 -C 30 )alkyl, substituted (C 1 -C 30 )heteroalkyl, substituted (C 1 -C 30 )acyl, substituted (C 2 -C 30 )alkenyl, substituted (C 2 -C 30 )alkynyl, substituted aryl(C 1 -C 30 )alkyl and substituted aryl(C 1 -C 30 )acyl; 
     R 4  and R 5  each is, independently for each occurrence, H, (C 1 -C 40 )alkyl, (C 1 -C 40 )heteroalkyl, (C 1 -C 40 )acyl, (C 2 -C 40 )alkenyl, (C 2 -C 40 )alkynyl, aryl(C 1 -C 40 )alkyl, aryl(C 1 -C 40 )acyl, substituted (C 1 -C 40 )alkyl, substituted (C 1 -C 40 )heteroalkyl, substituted (C 1 -C 40 )acyl, substituted (C 2 -C 40 )alkenyl, substituted (C 2 -C 40 )alkynyl, substituted aryl(C 1 -C 40 )alkyl, substituted aryl(C 1 -C 40 )acyl, (C 1 -C 40 )alkylsulfonyl or C(NH)—NH 2 ; 
     n is, independently for each occurrence, 1, 2, 3, 4 or 5; 
     m is, independently for each occurrence, 1, 2, 3, 4, 5, 6 or 7; 
     s is, independently for each occurrence, 1, 2, 3, 4, 5, 6 or 7; 
     t is, independently for each occurrence, 1, 2, 3, 4, 5, 6 or 7; 
     X 1 , X 2 , X 3 , X 4  and X 5  each is, independently for each occurrence, H, F, Cl, Br, I, (C 1-10 )alkyl, substituted (C 1-10 )alkyl, (C 2-10 )alkenyl, substituted (C 2-10 )alkenyl, (C 2-10 )alkynyl, substituted (C 2-10 )alkynyl, aryl, substituted aryl, OH, NH 2 , NO 2  or CN; provided that: 
     (I) when R 4  is (C 1 -C 40 )acyl, aryl(C 1 -C 40 )acyl, substituted (C 1 -C 40 )acyl, substituted aryl(C 1 -C 40 )acyl, (C 1 -C 40 )alkylsulfonyl or C(NH)—NH 2 , then R 5  is H, (C 1 -C 40 )alkyl, (C 1 -C 40 )heteroalkyl, (C 2 -C 40 )alkenyl, (C 2 -C 40 )alkynyl, aryl(C 1 -C 40 )alkyl, substituted (C 1 -C 40 )alkyl, substituted (C 1 -C 40 )heteroalkyl, substituted (C 2 -C 40 )alkenyl, substituted (C 2 -C 40 )alkynyl or substituted aryl(C 1 -C 40 )alkyl; 
     (II) when R 2  is (C 1 -C 30 )acyl, aryl(C 1 -C 30 )acyl, substituted (C 1 -C 30 )acyl or substituted aryl(C 1 -C 30 )acyl, then R 3  is H, (C 1 -C 30 )alkyl, (C 1 -C 30 )heteroalkyl, (C 2 -C 30 )alkenyl, (C 2 -C 30 )alkynyl, aryl(C 1 -C 30 )alkyl, substituted (C 1 -C 30 )alkyl, substituted (C 1 -C 30 )heteroalkyl, substituted (C 2 -C 30 )alkenyl, substituted (C 2 -C 30 )alkynyl or substituted aryl(C 1 -C 30 )alkyl; 
     (III) neither B 1  nor B 2  contains one or more of the following amino acid sequences: Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3  (SEQ ID NO:294), Tyr-Ala-Arg-Lys-Ala-(Arg) 2 -Gln-Ala-(Arg) 2  (SEQ ID NO:295), Tyr-Ala-Arg-(Ala) 2 -(Arg) 2 -(Ala) 2 -(Arg) 2  (SEQ ID NO:296), Tyr-Ala-(Arg) 9  (SEQ ID NO:297), Tyr-(Ala) 3 -(Arg) 7  (SEQ ID NO:298), Tyr-Ala-Arg-Ala-Pro-(Arg) 2 -Ala-(Arg) 3  (SEQ ID NO:299) or Tyr-Ala-Arg-Ala-Pro-(Arg) 2 -Pro-(Arg) 2  (SEQ ID NO:300); 
     (IV) either B 1  or B 2  or both must be present in said compound; 
     (V) when A 2  is Cys, D-Cys, hCys, D-hCys, Pen or D-Pen, then A 9  is Cys, D-Cys, hCys, D-hCys, Pen or D-Pen; and 
     (VI) when A 2  is Asp or Glu, then A 9  is Dab, Dap, Orn or Lys; or pharmaceutically acceptable salts thereof. 
     In one aspect of the third embodiment, the invention is directed to the use of compounds of Formula (III) to treat insulin resistance in a mammalian subject, with or without weight loss, wherein 
     B 1  is Arg-Lys-Gln-Lys-(Arg) 5  (SEQ ID NO:301), Arg-(Lys) 2 -Arg-Gln-(Arg) 4  (SEQ ID NO:302), Arg-(Lys) 2 -(Arg) 3 -Gln-(Arg) 2  (SEQ ID NO:303), Arg-(Lys) 2 -(Arg) 4 -Gln-Arg (SEQ ID NO:304), Arg-(Lys) 2 -(Arg) 5 -Gln (SEQ ID NO:305), Arg-(Lys) 2 -Gln-(Arg) 5  (SEQ ID NO:306), Arg-Gln-(Lys) 2 -(Arg) 5  (SEQ ID NO:307), Arg-Gln-(Arg) 7  (SEQ ID NO:308), Arg-Gln-(Arg) 5  (SEQ ID NO:309), (Arg) 2 -Gln-(Arg) 6  (SEQ ID NO:310), (Arg) 2 -Gln-(Arg) 7  (SEQ ID NO:311), (Arg) 3 -Gln-(Arg) 5  (SEQ ID NO:312), (Arg) 3 -Gln-(Arg) 6  (SEQ ID NO:313), (Arg) 4 -Gln-(Arg) 4  (SEQ ID NO:314), (Arg) 4 -Gln-(Arg) 5  (SEQ ID NO:315), (Arg) 5  (SEQ ID NO:316), (Arg) 5 -Gln-(Arg) 3  (SEQ ID NO:317), (Arg) 5 -Gln-(Arg) 4  (SEQ ID NO:318), (Arg) 6  (SEQ ID NO:319), (Arg) 6 -Gln-(Arg) 3  (SEQ ID NO:320), (Arg) 7  (SEQ ID NO:321), (Arg) 7 -Gln-(Arg) 2  (SEQ ID NO:322), (Arg) 8  (SEQ ID NO:323), (Arg) 8 -Gln-Arg (SEQ ID NO:324), (Arg) 9  (SEQ ID NO:325), (Arg) 9 -Gln (SEQ ID NO:326), (D-Arg) 5 , (D-Arg) 6 , (D-Arg) 7 , (D-Arg) 8 , (D-Arg) 9 , Gln-Arg-(Lys) 2 -(Arg) 5  (SEQ ID NO:327), Gln-(Arg) 8  (SEQ ID NO:328), Gln-(Arg) 9  (SEQ ID NO:329), Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3  (SEQ ID NO:330); Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -Doc (SEQ ID NO:331); or deleted; 
     B 2  is β-Ala, β-Ala-Gly, β-Ala-Tyr, β-Ala-Tyr-Gly, (β-Ala) 2 , (β-Ala) 2 -Gly, (β-Ala) 2 -Tyr, (β-Ala) 2 -Tyr-Gly (SEQ ID NO:332), Doc, Doc-Gly, Doc-Tyr, Doc-Tyr-Gly, (Doc) 2 , (Doc) 2 -Gly, (Doc) 2 -Tyr, (Doc) 2 -Tyr-Gly (SEQ ID NO:333), or deleted; 
     B 3  is Arg-Lys-Gln-Lys-(Arg) 5  (SEQ ID NO:301), Arg-Lys-(Arg) 3 -Gln-(Arg) 3  (SEQ ID NO:334), Arg-(Lys) 2 -Arg-Gln-(Arg) 4  (SEQ ID NO:302), Arg-(Lys) 2 -Gln-(Arg) 5  (SEQ ID NO:306), Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3  (SEQ ID NO:294), Arg-(Lys) 2 -(Arg) 3 -Gln-(Arg) 2  (SEQ ID NO:303), Arg-(Lys) 2 -(Arg) 4 -Gln-Arg (SEQ ID NO:304), Arg-(Lys) 2 -(Arg) 5 -Gln (SEQ ID NO:305), Arg-Gln-(Lys) 2 -(Arg) 5  (SEQ ID NO:307), Arg-Gln-(Arg) 7  (SEQ ID NO:308), Arg-Gln-(Arg) 8  (SEQ ID NO:309), (Arg) 2 -Lys-(Arg) 2 -Gln-(Arg) 3  (SEQ ID NO:335), (Arg) 2 -Gln-(Arg) 6  (SEQ ID NO:310), (Arg) 2 -Gln-(Arg) 7  (SEQ ID NO:311), (Arg) 3 -Gln-(Arg) 5  (SEQ ID NO:312), (Arg) 3 -Gln-(Arg) 6  (SEQ ID NO:313), (Arg) 4 -Gln-(Arg) 4  (SEQ ID NO:314), (Arg) 4 -Gln-(Arg) 5  (SEQ ID NO:315), (Arg) 5  (SEQ ID NO:316), (Arg) 5 -Gln-(Arg) 3  (SEQ ID NO:317), (Arg) 5 -Gln-(Arg) 4  (SEQ ID NO:318), (Arg) 6  (SEQ ID NO:319), (Arg) 6 -Gln-(Arg) 3  (SEQ ID NO:320), (Arg) 7  (SEQ ID NO:321), (Arg) 7 -Gln-(Arg) 2  (SEQ ID NO:322), (Arg) 8  (SEQ ID NO:323), (Arg)s-Gln-Arg (SEQ ID NO:324), (Arg) 9  (SEQ ID NO:325), (Arg) 9 -Gln (SEQ ID NO:326), (D-Arg) 5 , (D-Arg) 6 , (D-Arg) 7 , (D-Arg)s, (D-Arg) 9 , Gln-Arg-(Lys) 2 -(Arg) 5  (SEQ ID NO:327), Gln-(Arg) 8  (SEQ ID NO:328), Gln-(Arg) 9  (SEQ ID NO:329), or deleted; 
     A 1  is A6c, Cha, hCha, Chg, D-Chg, hChg, Gaba, hLeu, Met, β-hMet, D-2-Nal, Nip, Nle, Oic, Phe, D-Phe, hPhe, hPro, or deleted; 
     A 2  is Cys 
     A 3  is D-Abu, Aib, Ala, β-Ala, D-Ala, D-Cha, Gaba, Glu, Gly, D-Ile, D-Leu, D-Met, D-Nle, D-Phe, D-Tle, D-Trp, D-Tyr, D-Val, or deleted; 
     A 4  is His; 
     A 5  is D-Bal, D-1-Nal, D-2-Nal, D-Phe, D-(X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe, D-Trp, or D-(Et)Tyr; 
     A 6  is Arg or hArg; 
     A 7  is Bal, Bip, 1-Nal, 2-Nal, Trp, or D-Trp; 
     A 8  is A5c, A6c, Aha, Ahx, Ala, β-Ala, Apn, Gaba, Gly, or deleted; 
     A 9  is Cys, D-Cys, hCys, D-hCys, Lys, Pen, or D-Pen; 
     A 10  is Pro, Thr or deleted; 
     A 11  is Pro or deleted; 
     A 12  is arg, Lys, or deleted; 
     A 13  is Asp or deleted; 
     each of R 2  and R 3  is, independently, H or acyl; 
     or pharmaceutically acceptable salts thereof. 
     Preferred ligands of the immediately foregoing group of compounds according to Formula (III), useful to treat insulin resistance in a mammalian subject, with or without weight loss, are compounds of the formula: 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               (SEQ ID NO: 60)                Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-NH 2 ;                        (SEQ ID NO: 61)                Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -Doc-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-NH 2 ;                        (SEQ ID NO: 62)                Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-β-Ala-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 62)                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-β-Ala-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 63)                Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-(Doc) 2 -Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 64)                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-(Pro) 2 -Lys-Asp-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 65)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Gly-Cys)-(Pro) 2 -Lys-Asp-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 66)                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-(β-Ala) 2 -Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 67)                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-(Pro) 2 -Lys-Asp-Doc-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 68)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Gly-Cys)-(Pro) 2 -Lys-Asp-Doc-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 69)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 69)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-Doc-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 70)                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-(Doc) 2 -Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 71)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-                   (Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 72)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 73)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 74)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 75)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   Arg-Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 76)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   Gln-(Arg) 5 -NH 2 ;                    (SEQ ID NO: 77)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Lys-                   Gln-Lys-(Arg) 5 -NH 2 ;                    (SEQ ID NO: 78)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 4 -Gln-Arg-NH 2 ;                    (SEQ ID NO: 79)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Aib-Arg-(Lys) 2 -                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 80)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 80)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 81)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 82)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 82)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 81)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 83)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 84)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 83)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 85)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 3 -Gln-(Arg) 2 -NH 2 ;                    (SEQ ID NO: 86)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Gln-                   (Lys) 2 -(Arg) 5 -NH 2 ;                    (SEQ ID NO: 87)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 5 -Gln-NH 2 ;                    (SEQ ID NO: 71)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-                   (Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 71)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 88)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 2 -Lys-(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 89)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Arg-Lys-(Arg) 3 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 88)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 2 -Lys-(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 90)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 2 -                   Lys-(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 91)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-(Arg) 2 -Lys-                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 92)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-Arg-Lys-                   (Arg) 3 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 93)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 2 -Lys-(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 94)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Arg-Lys-(Arg) 3 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 95)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 2 -                   Lys-(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 96)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Lys-                   (Arg) 3 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 97)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-(Arg) 2 -Lys-                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 92)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-Arg-Lys-                   (Arg) 3 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 98)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 2 -Lys-(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 99)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Arg-Lys-(Arg) 3 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 100)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 2 -                   Lys-(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 101)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Lys-                   (Arg) 3 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 102)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-(Arg) 2 -Lys-                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 103)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-Arg-Lys-                   (Arg) 3 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 104)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 2 -Lys-(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 105)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Arg-Lys-(Arg) 3 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 100)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 2 -Lys-                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 101)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Lys-                   (Arg) 3 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 102)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-(Arg) 2 -Lys-                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 103)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-Arg-Lys-(Arg) 3 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 106)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   Arg-Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 107)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   Gln-(Arg) 5 -NH 2 ;                    (SEQ ID NO: 108)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Lys-                   Gln-Lys-(Arg) 5 -NH 2 ;                    (SEQ ID NO: 109)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Gln-                   (Lys) 2 -(Arg) 5 -NH 2 ;                    (SEQ ID NO: 110)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 3 -Gln-(Arg) 2 -NH 2 ;                    (SEQ ID NO: 111)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 4 -Gln-Arg-NH 2 ;                    (SEQ ID NO: 112)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 5 -Gln-NH 2 ;                    (SEQ ID NO: 113)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 113)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 114)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 114)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 115)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 115)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 116)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 116)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 117)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 117)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 118)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 118)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 119)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 119)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 120)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 120)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 121)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 121)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 122)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 6 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 122)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 6 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 123)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 123)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 124)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 124)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 125)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 125)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 126)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 126)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 127)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 6 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 127)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 6 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 128)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 128)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 129)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 129)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 130)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 130)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 131)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 131)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 132)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 133)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 133)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 134)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 134)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 135)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 6 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 135)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 6 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 136)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 137)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-Arg-(Lys) 2 -Arg-Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 136)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 138)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 138)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 138)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 139)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 140)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 141)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 2 -Lys-(Arg) 2 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 142)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-Arg-Lys-(Arg) 3 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 141)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Gly-(Arg) 2 -Lys-(Arg) 2 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 142)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Gly-Arg-Lys-(Arg) 3 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 143)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 2 -Lys-(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 144)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Arg-Lys-(Arg) 3 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 145)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-Arg-(Lys) 2 -Arg-Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 146)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 148)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 147)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 147)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 148)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 149)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 149)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 151)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 150)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 150)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 151)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 152)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 152)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 154)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 153)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 153)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 154)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 155)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 155)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 157)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 156)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 156)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 157)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 158)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 158)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 159)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 160)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 161)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Ala-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 162)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Ala-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 164)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 163)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 163)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 164)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 165)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 165)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 166)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 166)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 168)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 167)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 167)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 168)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 170)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 169)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 169)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 170)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 171)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 171)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 173)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 172)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 172)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 173)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 174)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 174)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 175)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-β-Ala-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 176)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-β-Ala-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 177)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Ahx-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 178)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Ahx-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 179)                D-Phe-c(Cys-His-D-Phe-Arg-Trp-β-Ala-D-Cys)-Thr-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 180)                D-Phe-c(Cys-His-D-Phe-Arg-Trp-β-Ala-D-Cys)-Thr-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 181)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 182)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 183)                Ac-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 184)                Ac-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 183)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 185)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 186)                Ac-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 185)                Ac-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 186)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 188)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 187)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 188)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 189)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 190)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 189)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 190)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 191)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 192)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 191)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 192)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 193)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 194)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 193)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 194)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 195)                Ac-D-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 196)                Ac-D-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 197)                Ac-hPhe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 198)                Ac-hPhe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 199)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Apn-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 200)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Apn-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 199)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Ahx-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 200)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Ahx-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 201)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-β-Ala-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 202)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-β-Ala-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 203)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 203)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 205)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 204)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 204)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 205)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 207)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 206)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-Doc-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 206)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 207)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 208)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 208)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 209)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 210)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 209)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 211)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 212)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 213)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 213)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 267)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 214)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 216)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 214)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-Doc-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 217)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 215)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 216)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 215)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 217)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 218)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 219)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 218)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 219)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 221)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 220)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 221)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 222)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 223)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 222)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 223)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 224)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 225)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 224)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 225)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 227)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 226)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 228)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 227)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 228)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 229)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 230)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 232)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 231)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 232)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 233)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Gly-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 234)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Gly-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 235)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 236)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 235)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 236)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 237)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 238)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 237)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 238)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 239)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 240)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 239)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 240)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 241)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 242)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 241)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 242)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 243)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 244)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 243)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 244)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 245)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 246)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 245)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 246)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 247)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 248)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 247)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 248)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 249)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 250)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 249)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 250)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 251)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 252)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 251)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 252)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 253)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 254)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 253)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 254)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 255)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 256)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 255)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 256)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 257)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 258)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 257)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 258)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 259)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 260)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 259)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 260)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 261)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 262)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 261)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 262)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 263)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 264)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 263)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 264)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 265)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 266)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 265)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;           or                    (SEQ ID NO: 266)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;;                
or pharmaceutically acceptable salts thereof.
 
     In a fourth embodiment, the invention provides a method to treat insulin resistance in a mammalian subject, with or without weight loss, by the administration of a therapeutically effective amount of a melanocortin receptor compound according to Formula (IV), and pharmaceutically acceptable salts, hydrates, solvates and prodrugs thereof, with a compound having the following formula (formula (IV)):
 
Ac- c (Cys-Glu-His-A 1 -Arg-A 2 -A 3 -Cys)-(Pro) 2 -Lys-Asp-NH 2   (IV)
 
wherein:
     A 1  is the D-isomer of X-Phe or 2-Nal where X is halogen;   A 2  is Bal, 1-Nal, 2-Nal, or Trp; and   A 3  is Aib, Ala, β-Ala or Gly,
 
or pharmaceutically acceptable salts thereof.
   

     Preferred compounds of the immediately foregoing formula discovered to treat insulin resistance in a mammalian subject, with or without weight loss, include the following: 
                                                                                                   (SEQ ID NO: 268)            Ac-c(Cys-Glu-His-D-4-Br-Phe-Arg-Trp-Gly-Cys)-               (Pro) 2 -Lys-Asp-NH 2;                      (SEQ ID NO: 269)            Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-               (Pro) 2 -Lys-Asp-NH 2 ;                    (SEQ ID NO: 269)            Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-               (Pro) 2 -Lys-Asp-NH 2 ;                    (SEQ ID NO: 269)            Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-               (Pro) 2 -Lys-Asp-NH 2 ;                    (SEQ ID NO: 2690)            Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-               (Pro) 2 -Lys-Asp-NH 2 ;                    (SEQ ID NO: 270)            Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-β-Ala-Cys)-               (Pro) 2 -Lys-Asp-NH 2 ;       or                    (SEQ ID NO: 270)            Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Aib-Cys)-               (Pro) 2 -Lys-Asp-NH 2 ;            
or pharmaceutically acceptable salts thereof.
 
     The invention additionally provides a method to treat insulin resistance in a mammalian subject, with or without weight loss, by the administration of a therapeutically effective amount of a melanocortin receptor compound modified with a hydantoin moiety according to Formula (V), (VI) or (VII), and pharmaceutically acceptable salts, hydrates, solvates or prodrugs thereof. 
     According to a fifth embodiment, the invention provides a method to treat insulin resistance in a mammalian subject, with or without weight loss, by the administration of a therapeutically effective amount of a melanocortin receptor ligand according to the following formula (Formula (V)), pharmaceutically-acceptable salts, hydrates, solvates and/or prodrugs thereof (see International Patent Application Number PCT/US08/06675 incorporated herein by reference in its entirety): 
                                
wherein
 
     X is selected from the group consisting of —CH 2 —S—S—CH 2 —, —C(CH 3 ) 2 —S—S—CH 2 —, —CH 2 —S—S—C(CH 3 ) 2 —, —C(CH 3 ) 2 —S—S—C(CH 3 ) 2 —, —(CH 2 ) 2 —S—S—CH 2 —, —CH 2 —S—S—(CH 2 ) 2 —, —(CH 2 ) 2 —S—S—(CH 2 ) 2 —, —C(CH 3 ) 2 —S—S—(CH 2 ) 2 —, —(CH 2 ) 2 —S—S—C(CH 3 ) 2 —, —(CH 2 ) t —C(O)—NR 8 —(CH 2 ) r — and —(CH 2 ) r — NR 8 —C(O)—(CH 2 ) t —; 
     R 1  and R 2  each is, independently, H, (C 1 -C 10 )alkyl or substituted (C 1 -C 10 )alkyl; 
     R 3  is —OH or —NH 2 ; 
     R 4  and R 5  each is, independently, H, (C 1 -C 10 )alkyl or substituted (C 1 -C 10 )alkyl; 
     X 1  is 
     
       
                 
         
             
             
         
      
     
     A 1  is His, 2-Pal, 3-Pal, 4-Pal, (X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe, Taz, 2-Thi, 3-Thi or is deleted; 
     A 2  is D-Bal, D-1-Nal, D-2-Nal, D-Phe or D-(X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe; 
     A 3  is Arg, hArg, Dab, Dap, Lys or Orn; 
     A 4  is Bal, 1-Nal, 2-Nal, (X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe or Trp; 
     R 6  and R 7  each is, independently for each occurrence thereof, H, (C 1 -C 10 )alkyl, (C 1 -C 10 )heteroalkyl, aryl(C 1 -C 5 )alkyl, substituted (C 1 -C 10 )alkyl, substituted (C 1 -C 10 )heteroalkyl or substituted aryl(C 1 -C 5 )alkyl provided that R 6  and R 7  may be joined together to form a ring; 
     R 8  is H, (C 1 -C 10 )alkyl or substituted (C 1 -C 10 )alkyl; 
     r is, independently for each occurrence thereof, 1, 2, 3, 4 or 5; and 
     t is, independently for each occurrence thereof, 1 or 2. 
     Preferrably, a compound according the foregoing formula found useful to treat insulin resistance in a mammalian subject, with or without weight loss, include compounds wherein X 1  is selected from the group consisting of: 
                                
Representative embodiments of the foregoing class of compounds useful to treat insulin resistance in a mammalian subject, with or without weight loss, are as follows:
 
     
       
         
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
               
             
           
               
                 (SEQ ID NO: 271) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Cys-D-Ala))-His-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Cys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 271) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(hCys-D-Ala))-His-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Cys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 272) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Cys-D-Ala))-His-D-2-Nal-Arg-Trp- 
               
               
                   
               
               
                 Cys]-NH 2 ; 
               
               
                 or 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 272) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(hCys-D-Ala))-His-D-2-Nal-Arg- 
               
               
                   
               
               
                 Trp-Cys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 273) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-D-Ala))-His-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 273) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-D-Ala))-His-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Orn]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 273) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-D-Ala))-His-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Dab]-NH 2 ; 
               
               
                 or 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 273) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-D-Ala))-His-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Dap]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 275) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-His))-D-2-Nal-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 274) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-His))-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2   
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 274) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-A3c))-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 274) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-A5c))-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 274) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-A6c))-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 275) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-A3c))-D-2-Nal-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 275) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-A5c))-D-2-Nal-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 275) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-A6c))-D-2-Nal-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 274) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-Aic))-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 274) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-Apc))-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 275) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-Aic))-D-2-Nal-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 275) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Asp-Apc))-D-2-Nal-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 275) 
               
             
          
           
               
                 c[Hydantoin-(C(O)-(Asp-Aic))-D-2-Nal-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2   
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 275) 
               
             
          
           
               
                 c[Hydantoin-(C(O)-(Asp-Apc))-D-2-Nal-Arg-Trp- 
               
               
                   
               
               
                 Lys]-NH 2   
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 276) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Orn]-NH 2 ; 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 276) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Dab]-NH 2 ; 
               
               
                 or 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 276) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Dap]-NH 2 , 
               
               
                   
               
             
          
           
               
                 (SEQ ID NO: 277) 
               
             
          
           
               
                 c[Hydantoin(C(O)-(Glu-His))-D-Phe-Arg-Trp- 
               
               
                   
               
               
                 Dap]-NH 2   
               
             
          
         
       
     
     According to a sixth embodiment, the invention provides a method to treat insulin resistance in a mammalian subject, with or without weight loss, by the administration of a therapeutically effective amount of a melanocortin receptor compound according to Formula (VI), pharmaceutically-acceptable salts, hydrates, solvates and/or prodrugs thereof (see International Patent Application Number PCT/US08/06675 which is incorporated herein by reference in its entirety): 
                                
wherein
 
     X 1  is 
     
       
                 
         
             
             
         
      
     
     X 2  is 
     
       
                 
         
             
             
         
      
     
     A 1  is Asp, Cys, D-Cys, Dab, Dap, Glu, Lys, Orn, Pen or D-Pen; 
     A 2  is an L- or D-amino acid; 
     A 3  is His, 2-Pal, 3-Pal, 4-Pal, (X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe, Taz, 2-Thi or 3-Thi; 
     A 4  is D-Bal, D-1-Nal, D-2-Nal, D-Phe or D-(X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe; 
     A 5  is Arg, hArg, Dab, Dap, Lys or Orn; 
     A 6  is Bal, 1-Nal, 2-Nal, (X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe or Trp; 
     A 7  is Asp, Cys, D-Cys, Dab, Dap, Glu, Lys, Orn, Pen or D-Pen; 
     R 1  is H, (C 1 -C 10 )alkyl or substituted (C 1 -C 10 )alkyl; 
     R 2  and R 3  each is, independently, H, (C 1 -C 10 )alkyl, (C 1 -C 10 )heteroalkyl, aryl(C 1 -C 5 )alkyl, substituted (C 1 -C 10 )alkyl, substituted (C 1 -C 10 )heteroalkyl or substituted aryl(C 1 -C 5 )alkyl or R 2  and R 3  may be fused together form a cyclic moiety; 
     R 4  is CO 2 H or C(O)NH 2 ; 
     R 5  and R 6  each is, independently, H, (C 1 -C 10 )alkyl, (C 1 -C 10 )heteroalkyl, aryl(C 1 -C 5 )alkyl, substituted (C 1 -C 10 )alkyl, substituted (C 1 -C 10 )heteroalkyl or substituted aryl(C 1 -C 5 )alkyl or R 5  and R 6  may be fused together form a cyclic moiety; 
     R 7  and R 8  each is, independently, H, (C 1 -C 10 )alkyl, (C 1 -C 10 )heteroalkyl, aryl(C 1 -C 5 )alkyl, substituted (C 1 -C 10 )alkyl, substituted (C 1 -C 10 )heteroalkyl or substituted aryl(C 1 -C 5 )alkyl; or R 7  and R 8  may be fused together form a cyclic moiety; 
     R 9  is H, (C 1 -C 10 )alkyl or substituted (C 1 -C 10 )alkyl; and 
     n is, independently for each occurrence thereof, 1, 2, 3, 4, 5, 6 or 7; or a pharmaceutically acceptable salt thereof. 
     A preferred class of compounds according to Formula (VI) useful to treat insulin resistance in a mammalian subject, with or without weight loss, are those compounds wherein: 
     A 1  is Cys; 
     A 2  is D-Ala, Asn, Asp, Gln, Glu or D-Phe; 
     A 3  is His; 
     A 4  is D-2-Nal or D-Phe; 
     A 5  is Arg; 
     A 6  is Trp; and 
     A 7  is Cys or Pen; 
     each of R 1 , R 2 , R 3 , and R 9  is, independently, H; 
     R 4  is C(O)NH 2 ; 
     each of R 5  and R 6  is, independently, H, (C 1 -C 10 )alkyl, (C 1 -C 10 )heteroalkyl, substituted (C 1 -C 10 )alkyl or substituted (C 1 -C 10 )heteroalkyl or R 5  and R 6  may be fused together form a cyclic moiety; and 
     each of R 7  and R 8  is, independently, H, (C 1 -C 10 )alkyl, (C 1 -C 10 )heteroalkyl, substituted (C 1 -C 10 )alkyl or substituted (C 1 -C 10 )heteroalkyl; 
     or pharmaceutically acceptable salts thereof. 
     Preferred compounds of the immediately foregoing formula (Formula (VI)) useful to treat insulin resistance in a mammalian subject, with or without weight loss, include: 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           (SEQ ID NO: 278)            Hydantoin(C(O)-(Arg-Gly))-c(Cys-Glu-His-D-Phe-Arg-               Trp-Cys)-NH 2 ;                    (SEQ ID NO: 278)            Hydantoin(C(O)-(Nle-Gly))-c(Cys-Glu-His-D-Phe-Arg-               Trp-Cys)-NH 2 ;                    (SEQ ID NO: 278)            Hydantoin(C(O)-(Gly-Gly))-c(Cys-Glu-His-D-Phe-Arg-               Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Nle-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Gly-Gly))-c(Cys-D-Ala-His-D-               Phe-Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 280)            Hydantoin(C(O)-(Nle-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Pen)-NH 2 ;                    (SEQ ID NO: 280)            Hydantoin(C(O)-(Gly-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Pen)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Ala-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(D-Ala-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Aib-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Val-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Ile-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Leu-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 281)            Hydantoin(C(O)-(Gly-Gly))-c(Cys-Glu-His-D-2-Nal-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 281)            Hydantoin(C(O)-(Nle-Gly))-c(Cys-Glu-His-D-2-Nal-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 278)            Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-Glu-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 278)            Hydantoin(C(O)-(Arg-Gly))-c(Cys-Glu-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Arg-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 282)            Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-D-Ala-His-D-2-               Nal-Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 282)            Hydantoin(C(O)-(Arg-Gly))-c(Cys-D-Ala-His-D-2-Nal-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 278)            Hydantoin(C(O)-(Nle-Gly))-c(Cys-Glu-His-D-Phe-Arg-               Trp-Cys)-NH 2 ;                    (SEQ ID NO: 278)            Hydantoin(C(O)-(Gly-Gly))-c(Cys-Glu-His-D-Phe-Arg-               Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Nle-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Gly-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 280)            Hydantoin(C(O)-(Nle-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Pen)-NH 2 ;                    (SEQ ID NO: 280)            Hydantoin(C(O)-(Gly-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Pen)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Ala-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(D-Ala-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Aib-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Val-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Ile-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Leu-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 278)            Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-Glu-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 278)            Hydantoin(C(O)-(Arg-Gly))-c(Cys-Glu-His-D-Phe-Arg-               Trp-Cys)-NH 2 ;                    (SEQ ID NO: 279)            Hydantoin(C(O)-(Arg-Gly))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;       or                    (SEQ ID NO: 279)            Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-D-Ala-His-D-               Phe-Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 283)            Hydantoin(C(O)-(Ala-Nle))-c(Cys-Glu-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 283)            Hydantoin(C(O)-(Val-Nle))-c(Cys-Glu-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 283)            Hydantoin(C(O)-(Gly-Nle))-c(Cys-Glu-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 284)            Hydantoin(C(O)-(A6c-Nle))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 284)            Hydantoin(C(O)-(Gly-Nle))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 284)            Hydantoin(C(O)-(Ala-Nle))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 284)            Hydantoin(C(O)-(D-Ala-Nle))-c(Cys-D-Ala-His-D-               Phe-Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 284)            Hydantoin(C(O)-(Val-Nle))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 284)            Hydantoin(C(O)-(Leu-Nle))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 284)            Hydantoin(C(O)-(Cha-Nle))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;       or                    (SEQ ID NO: 284)            Hydantoin(C(O)-(Aib-Nle))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 285)            Hydantoin(C(O)-(Gly-Arg))-c(Cys-Glu-His-D-Phe-Arg-               Trp-Cys)-NH 2 ;                    (SEQ ID NO: 285)            Hydantoin(C(O)-(Gly-Arg))-c(Cys-Glu-His-D-2-Nal-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 286)            Hydantoin(C(O)-(Gly-Arg))-c(Cys-D-Ala-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 286)            Hydantoin(C(O)-(Gly-Arg))-c(Cys-D-Ala-His-D-2-Nal-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 287)            Hydantoin(C(O)-(Gly-D-Arg))-c(Cys-Glu-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 287)            Hydantoin(C(O)-(Gly-D-Arg))-c(Cys-Glu-His-D-Phe-               Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 288)            Hydantoin(C(O)-(Gly-D-Arg))-c(Cys-D-Ala-His-D-               Phe-Arg-Trp-Cys)-NH 2 ;       and                    (SEQ ID NO: 288)            Hydantoin(C(O)-(Gly-D-Arg))-c(Cys-D-Ala-His-D-2-               Nal-Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 289);            Hydantoin(C(O)-(Nle-Ala))-c(Cys-Glu-His-D-Phe-Arg-               Trp-Cys)-NH 2              
or pharmaceutically acceptable salts thereof.
 
     In a seventh embodiment, the invention provides a method to treat insulin resistance in a mammalian subject, with or without weight loss, by the administration of a therapeutically effective amount of a melanocortin receptor ligand belonging to a class of cyclic peptide analogs that are ligands for the melanocortin receptors having a structure according to Formula (VII) as depicted below (see International Patent Application Number PCT/US08/06675 which is incorporated herein by reference in its entirety): 
                                
wherein
 
     X is selected from the group consisting of —CH 2 —S—S—CH 2 —, —C(CH 3 ) 2 —S—S—CH 2 —, —CH 2 —S—S—C(CH 3 ) 2 —, —C(CH 3 ) 2 —S—S—C(CH 3 ) 2 —, —(CH 2 ) 2 —S—S—CH 2 —, —CH 2 —S—S—(CH 2 ) 2 , —(CH 2 ) 2 —S—S—(CH 2 ) 2 —, —C(CH 3 ) 2 —S—S—(CH 2 ) 2 —, —(CH 2 ) 2 —S—S—C(CH 3 ) 2 —, —(CH 2 ) t —C(O)—NR 8 —(CH 2 ) r — and —(CH 2 ) r —NR 8 —C(O)—(CH 2 ) t —; 
     each of R 1  and R 5  is, independently, H, (C 1 -C 10 )alkyl or substituted (C 1 -C 10 )alkyl; 
     each of R 2  and R 3  is, independently, H, (C 1 -C 10 )alkyl, (C 1 -C 10 )heteroalkyl, aryl(C 1 -C 5 )alkyl, substituted (C 1 -C 10 )alkyl, substituted (C 1 -C 10 )heteroalkyl or substituted aryl(C 1 -C 5 )alkyl or R 2  and R 3  may be fused together to form a ring; 
     R 4  is OH or NH 2 ; 
     each of R 6  and R 7  is, independently, H, (C 1 -C 10 )alkyl or substituted (C 1 -C 10 )alkyl; 
     A 1  is an L- or D-amino acid or deleted; 
     A 2  is His, 2-Pal, 3-Pal, 4-Pal, (X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe, Taz, 2-Thi or 3-Thi; 
     A 3  is D-Bal, D-1-Nal, D-2-Nal, D-Phe or D-(X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe; 
     A 4  is Arg, hArg, Dab, Dap, Lys or Orn; 
     A 5  is Bal, 1-Nal, 2-Nal, (X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe or Trp; 
     r is, independently for each occurrence thereof, 1, 2, 3, 4 or 5; and 
     t is, independently for each occurrence thereof, 1 or 2; 
     or pharmaceutically acceptable salts thereof. 
     In the preferred aspect of the compounds according to Formula (VII) useful to treat insulin resistance in a mammalian subject, with or without weight loss, 
     A 1  is Ala, D-Ala, Asn, Asp, Gln, Glu or Gly; 
     or pharmaceutically acceptable salts thereof. 
     Preferred compounds according to Formula (VII) useful in the treatment of insulin resistance in a mammalian subject, include the following compounds: 
                                                                                                                                                                                       (SEQ ID NO: 290)            c[Hydantoin(C(O)-(Nle-Cys))-D-Ala-His-D-Phe-Arg-       Trp-Cys]-NH 2 ;                    (SEQ ID NO: 290)            c[Hydantoin(C(O)-(Ala-Cys))-D-Ala-His-D-Phe-Arg-               Trp-Cys]-NH 2 ;                    (SEQ ID NO: 290)            c[Hydantoin(C(O)-(D-Ala-Cys))-D-Ala-His-D-Phe-Arg-               Trp-Cys]-NH 2 ;                    (SEQ ID NO: 290)            c[Hydantoin(C(O)-(Aib-Cys))-D-Ala-His-D-Phe-Arg-               Trp-Cys]-NH 2 ;                    (SEQ ID NO: 290)            c[Hydantoin(C(O)-(Val-Cys))-D-Ala-His-D-Phe-Arg-               Trp-Cys]-NH 2 ;                    (SEQ ID NO: 290)            c[Hydantoin(C(O)-(Abu-Cys))-D-Ala-His-D-Phe-Arg-               Trp-Cys]-NH 2 ;                    (SEQ ID NO: 290)            c[Hydantoin(C(O)-(Leu-Cys))-D-Ala-His-D-Phe-Arg-               Trp-Cys]-NH 2 ;                    (SEQ ID NO: 290)            c[Hydantoin(C(O)-(Ile-Cys))-D-Ala-His-D-Phe-Arg-               Trp-Cys]-NH 2 ;                    (SEQ ID NO: 290)            c[Hydantoin(C(O)-(Cha-Cys))-D-Ala-His-D-Phe-               Arg-Trp-Cys]-NH 2 ;                    (SEQ ID NO: 290)            c[Hydantoin(C(O)-(A6c-Cys))-D-Ala-His-D-Phe-               Arg-Trp-Cys]-NH 2 ;                    (SEQ ID NO: 290)            c[Hydantoin(C(O)-(Phe-Cys))-D-Ala-His-D-Phe-Arg-               Trp-Cys]-NH 2 ;                    (SEQ ID NO: 290)            c[Hydantoin(C(O)-(Gly-Cys))-D-Ala-His-D-Phe-Arg-               Trp-Cys]-NH 2 ;       or                    (SEQ ID NO: 291)            c[Hydantoin(C(O)-(Gly-Cys))-Glu-His-D-Phe-Arg-               Trp-Cys]-NH 2 ;       or                    (SEQ ID NO: 291)            c[Hydantoin(C(O)-(Gly-Cys))-Glu-His-D-Phe-Arg-               Trp-Cys]-NH 2 ;            
or pharmaceutically acceptable salts thereof.
 
     In an eighth embodiment, the present invention is directed to a method to treat insulin resistance in a mammalian subject, with or without weight loss, by the administration of a therapeutically effective amount of a melanocortin receptor ligand according to Formula (VIII) (see International Patent Application Number PCT/US08/07411, incorporated herein by reference in its entirety):
 
(R 2 R 3 )-A 0 -A 1 - c (A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 )-A 10 -R 1   (VIII)
 
wherein:
 
     A 0  is an aromatic amino acid 
     A 1  is Acc, HN—(CH 2 ) m —C(O), an L- or D-amino acid; 
     A 2  is Asp, Cys, D-Cys, hCys, D-hCys, Glu, Pen, or D-Pen; 
     A 3  is Aib, Ala, β-Ala, Gaba, Gly or a D-amino acid; 
     A 4  is His, 2-Pal, 3-Pal, 4-Pal, (X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe, Taz, 2-Thi, or 3-Thi; 
     A 5  is D-Bal, D-1-Nal, D-2-Nal, D-Phe, L-Phe, D-(X 1 ,X 2 ,X 3 ,X 4 ,X 5 )Phe, L-Phe, D-Trp or D-(Et)Tyr; 
     A 6  is Arg, hArg, Dab, Dap, Lys, Orn, or HN—CH((CH 2 ) n —N(R 4 R 5 ))—C(O); 
     A 7  is Bal, D-Bal, Bip, D-Bip, 1-Nal, D-1-Nal, 2-Nal, D-2-Nal, or D-Trp; 
     A 8  is Acc, Aha, Ahx, Ala, D-Ala, β-Ala, Apn, Gaba, Gly, HN—(CH 2 ) s —C(O), or deleted; 
     A 9  is Cys, D-Cys, hCys, D-hCys, Dab, Dap, Lys, Orn, Pen, or D-Pen; 
     A 10  is Acc, HN—(CH 2 ) t —C(O), L- or D-amino acid, or deleted; 
     R 1  is OH, or NH 2 ; 
     each of R 2  and R 3  is, independently for each occurrence selected from the group consisting of H, (C 1 -C 30 )alkyl, (C 1 -C 30 )heteroalkyl, (C 1 -C 30 )acyl, (C 2 -C 30 )alkenyl, (C 2 -C 30 )alkynyl, aryl(C 1 -C 30 )alkyl, aryl(C 1 -C 30 )acyl, substituted (C 1 -C 30 )alkyl, substituted (C 1 -C 30 )heteroalkyl, substituted (C 1 -C 30 )acyl, substituted (C 2 -C 30 )alkenyl, substituted (C 2 -C 30 )alkynyl, substituted aryl(C 1 -C 30 )alkyl, and substituted aryl(C 1 -C 30 )acyl; 
     each of R 4  and R 5  is, independently for each occurrence, H, (C 1 -C 40 )alkyl, (C 1 -C 40 )heteroalkyl, (C 1 -C 40 )acyl, (C 2 -C 40 )alkenyl, (C 2 -C 40 )alkynyl, aryl(C 1 -C 40 )alkyl, aryl(C 1 -C 40 )acyl, substituted (C 1 -C 40 )alkyl, substituted (C 1 -C 40 )heteroalkyl, substituted (C 1 -C 40 )acyl, substituted (C 2 -C 40 )alkenyl, substituted (C 2 -C 40 )alkynyl, substituted aryl(C 1 -C 40 )alkyl, substituted aryl(C 1 -C 40 )acyl, (C 1 -C 40 )alkylsulfonyl, or —C(NH)—NH 2 ; 
     m is, independently for each occurrence, 1, 2, 3, 4, 5, 6 or 7; 
     n is, independently for each occurrence, 1, 2, 3, 4 or 5; 
     s is, independently for each occurrence, 1, 2, 3, 4, 5, 6, or 7; 
     t is, independently for each occurrence, 1, 2, 3, 4, 5, 6, or 7; 
     X 1 , X 2 , X 3 , X 4 , and X 5  each is, independently for each occurrence, H, F, Cl, Br, I, (C 1-10 )alkyl, substituted (C 1-10 )alkyl, (C 2-10 )alkenyl, substituted (C 2-10 )alkenyl, (C 2-10 )alkynyl, substituted (C 2-10 )alkynyl, aryl, substituted aryl, OH, NH 2 , NO 2 , or CN; provided that 
     (I). when R 4  is (C 1 -C 40 )acyl, aryl(C 1 -C 40 )acyl, substituted (C 1 -C 40 )acyl, 
     substituted aryl(C 1 -C 40 )acyl, (C 1 -C 40 )alkylsulfonyl, or —C(NH)—NH 2 , then R 5  is H or (C 1 -C 40 )alkyl, (C 1 -C 40 )heteroalkyl, (C 2 -C 40 )alkenyl, (C 2 -C 40 )alkynyl, aryl(C 1 -C 40 )alkyl, substituted (C 1 -C 40 )alkyl, substituted (C 1 -C 40 )heteroalkyl, substituted (C 2 -C 40 )alkenyl, substituted (C 2 -C 40 )alkynyl, or substituted aryl(C 1 -C 40 )alkyl; 
     (II). when R 2  is (C 1 -C 30 )acyl, aryl(C 1 -C 30 )acyl, substituted (C 1 -C 30 )acyl, or substituted aryl(C 1 -C 30 )acyl, then R 3  is H, (C 1 -C 30 )alkyl, (C 1 -C 30 )heteroalkyl, (C 2 -C 30 )alkenyl, (C 2 -C 30 )alkynyl, aryl(C 1 -C 30 )alkyl, substituted (C 1 -C 30 )alkyl, substituted (C 1 -C 30 )heteroalkyl, substituted (C 2 -C 30 )alkenyl, substituted (C 2 -C 30 )alkynyl, or substituted aryl(C 1 -C 30 )alkyl; 
     (III). when A 2  is Cys, D-Cys, hCys, D-hCys, Pen, or D-Pen, then A 9  is Cys, D-Cys, hCys, D-hCys, Pen, or D-Pen; 
     (IV). when A 2  is Asp or Glu, then A 9  is Dab, Dap, Orn, or Lys; 
     (V). when A 8  is Ala or Gly, then A 1  is not Nle; or pharmaceutically acceptable salts thereof. 
     A preferred group of compounds of the immediate foregoing formula useful to treat insulin resistance in a mammalian subject, with or without weight loss, is wherein 
     A 0  is 1-Nal, 2-Nal, His, Pff, Phe, Trp, or Tyr; 
     A 1  is Arg; 
     A 2  is Cys; 
     A 3  is D-Ala; 
     A 4  is His; 
     A 5  is D-Phe 
     A 6  is Arg; 
     A 7  is Trp 
     A 8  is deleted; 
     A 9  is Cys; and 
     A 10  is deleted; 
     or pharmaceutically acceptable salts thereof. 
     Preferred compounds of the immediately foregoing group of compounds is which are useful to treat insulin resistance in a mammalian subject, with or without weight loss, of the formula: 
                                                                                                               (SEQ ID NO: 292)            Ac-Tyr-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 292)            Ac-2-Nal-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-               NH 2 ;                    (SEQ ID NO: 292)            Ac-1-Nal-Arg-c(Cys-D-Ala-His-DPhe-Arg-Trp-Cys)-               NH 2 ;                    (SEQ ID NO: 292)            Ac-Phe-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 292)            Ac-Trp-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 292)            Ac-Pff-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                    (SEQ ID NO: 293)            H-His-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;       or                    (SEQ ID NO: 292)            Ac-His-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;            
or pharmaceutically acceptable salts thereof.
 
     In yet another preferred embodiment, the compound or compounds of Formula (I), (II), (III), (IV), (V), (VI), (VII) or (VIII) as defined hereinabove, which are useful to treat insulin resistance in a mammalian subject, with or without weight loss, or a pharmaceutically acceptable salt thereof, are provided to said subject in need in a composition with a pharmaceutically acceptable carrier or diluent. 
     In preferred embodiment, the invention provides a method of treating insulin resistance in a subject in need thereof, comprising peripheral administration of an effective amount of a melanocortin receptor 4 agonist to treat the insulin resistance in the subject in need thereof. 
     In one aspect, the melanocortin receptor 4 agonist useful to treat insulin resistance with or without an accompanying reduction in body weight in the subject in need thereof, is selected from the group consisting of: 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           SEQ ID NO: 1                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-β-Ala-Lys)-NH 2 ;                        SEQ ID NO: 1                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-A6c-Lys)-NH 2 ;                        SEQ ID NO: 2                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Ahx-Cys)-NH 2 ;                        SEQ ID NO: 3                D-Phe-c(Cys-His-D-Phe-Arg-Trp-Ala-D-Cys)-Thr-NH 2 ;                        SEQ ID NO: 3                D-Phe-c(Cys-His-D-Phe-Arg-Trp-β-Ala-D-Cys)-Thr-NH 2 ;                        SEQ ID NO: 3                D-Phe-c(Cys-His-D-Phe-Arg-Trp-Gaba-D-Cys)-Thr-NH 2 ;                        SEQ ID NO: 2                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-NH 2 ;                        SEQ ID NO: 4                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Apn-Lys)-NH 2 ;                        SEQ ID NO: 5                Ac-A6c-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 6                Ac-D-2-Nal-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 6                Ac-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 6                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 7                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 7                Ac-Nle-c(Cys-β-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 7                Ac-Nle-c(Cys-Gaba-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 7                Ac-Nle-c(Cys-Aib-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 7                Ac-Nle-c(Cys-Gly-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 8                Ac-Nle-c(D-Cys-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 8                Ac-Nle-c(D-Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 8                Ac-Nle-c(D-Cys-β-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 8                Ac-Nle-c(D-Cys-Gaba-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 8                Ac-Nle-c(D-Cys-Aib-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 8                Ac-Nle-c(D-Cys-Gly-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 9                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                        SEQ ID NO: 9                Ac-Nle-c(Cys-β-Ala-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                        SEQ ID NO: 9                Ac-Nle-c(Cys-Gaba-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                        SEQ ID NO: 9                Ac-Nle-c(Cys-Aib-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                        SEQ ID NO: 9                Ac-Nle-c(Cys-Gly-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                        SEQ ID NO: 10                Ac-Nle-c(D-Cys-Ala-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                        SEQ ID NO: 10                Ac-Nle-c(D-Cys-D-Ala-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                        SEQ ID NO: 10                Ac-Nle-c(D-Cys-β-Ala-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                        SEQ ID NO: 10                Ac-Nle-c(D-Cys-Gaba-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                        SEQ ID NO: 10                Ac-Nle-c(D-Cys-Aib-His-D-Phe-Arg-Trp-D-Cys)-NH 2 ;                        SEQ ID NO: 11                Ac-Oic-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-D-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-Nip-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-hPro-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-hLeu-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-Phe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-D-Phe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-D-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 12                n-butanoyl-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-hPhe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-β-hMet-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 11                Ac-Gaba-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 13                Ac-Cha-c(Asp-His-D-Phe-Arg-D-Trp-Ala-Lys)-NH 2 ;                        SEQ ID NO: 13                Ac-hCha-c(Asp-His-D-Phe-Arg-D-Trp-Ala-Lys)-NH 2 ;                        SEQ ID NO: 13                Ac-Leu-c(Asp-His-D-Phe-Arg-D-Trp-Ala-Lys)-NH 2 ;                        SEQ ID NO: 13                Ac-hLeu-c(Asp-His-D-Phe-Arg-D-Trp-Ala-Lys)-NH 2 ;                        SEQ ID NO: 13                Ac-Phe-c(Asp-His-D-Phe-Arg-D-Trp-Ala-Lys)-NH 2 ;                        SEQ ID NO: 14                Ac-Nle-c(Asp-His-D-Phe-Arg-D-Trp-D-Ala-Lys)-NH 2 ;                        SEQ ID NO: 14                Ac-Nle-c(Asp-His-D-Phe-Arg-D-Trp-β-Ala-Lys)-NH 2 ;                        SEQ ID NO: 14                Ac-Nle-c(Asp-His-D-Phe-Arg-D-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 14                Ac-Nle-c(Asp-His-D-Phe-Arg-D-Trp-Aha-Lys)-NH 2 ;                        SEQ ID NO: 14                Ac-Nle-c(Asp-His-D-Phe-Arg-D-Trp-Apn-Lys)-NH 2 ;                        SEQ ID NO: 15                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Apn-Cys)-NH 2 ;                        SEQ ID NO: 15                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 15                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Ahx-Cys)-NH 2 ;                        SEQ ID NO: 15                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-β-Ala-Cys)-NH 2 ;                        SEQ ID NO: 15                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-D-Ala-Cys)-NH 2 ;                        SEQ ID NO: 16                Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 16                Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-2-Nal-Cys)-NH 2 ;                        SEQ ID NO: 16                Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-1-Nal-Cys)-NH 2 ;                        SEQ ID NO: 17                n-butanoyl-Nle-c(Cys-D-Ala-His-D-Phe-Arg-2-Nal-Cys)-NH 2 ;                        SEQ ID NO: 17                n-butanoyl-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 18                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-2-Nal-Cys)-NH 2 ;                        SEQ ID NO: 18                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-1-Nal-Cys)-NH 2 ;                        SEQ ID NO: 18                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Bal-Cys)-NH 2 ;                        SEQ ID NO: 61                Ac-Nle-c(Cys-D-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 19                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-D-Ala-Lys)-NH 2 ;                        SEQ ID NO: 20                Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-Bal-Cys)-NH 2 ;                        SEQ ID NO: 21                Ac-Nle-c(Pen-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 22                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-NH 2 ;                        SEQ ID NO: 22                Ac-Nle-c(Pen-D-Ala-His-D-Phe-Arg-Trp-Pen)-NH 2 ;                        SEQ ID NO: 23                D-Phe-c(Cys-His-D-Phe-hArg-Trp-β-Ala-D-Cys)-Thr-NH 2 ;                        SEQ ID NO: 24                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-Thr-NH 2 ;                        SEQ ID NO: 25                D-Phe-c(Cys-His-D-Phe-Arg-Bip-β-Ala-D-Cys)-Thr-NH 2 ;                        SEQ ID NO: 24                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-NH 2 ;                        SEQ ID NO: 26                D-Phe-c(Cys-His-D-Phe-hArg-Bip-β-Ala-D-Cys)-Thr-NH 2 ;                        SEQ ID NO: 26                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-NH 2 ;                        SEQ ID NO: 27                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-NH 2 ;                        SEQ ID NO: 28                Ac-Nle-c(Asp-D-Ala-His-D-Phe-Arg-Trp-Lys)-NH 2 ;                        SEQ ID NO: 28                Ac-Nle-c(Asp-D-Ala-His-D-Phe-Arg-Bal-Lys)-NH 2 ;                        SEQ ID NO: 29                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-OH;                        SEQ ID NO: 30                Ac-Nle-c(Cys-D-Abu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 30                Ac-Nle-c(Cys-D-Val-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 30                Ac-Nle-c(Cys-D-Ile-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 30                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 30                Ac-Nle-c(Cys-D-Tle-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 30                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 31                Ac-Nle-c(Pen-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 32                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Pen)-NH 2 ;                        SEQ ID NO: 32                Ac-Nle-c(Pen-His-D-Phe-Arg-Trp-Gaba-Pen)-NH 2 ;                        SEQ ID NO: 33                Ac-Leu-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 33                Ac-Cha-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 33                Ac-Ile-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 33                Ac-Phe-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 33                Ac-Val-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 33                Ac-2-Nal-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 34                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 34                Phe-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 35                Ac-Nle-c(Cys-3-Pal-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 36                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-OH;                        SEQ ID NO: 37                Ac-Nle-c(Cys-His-Phe-Arg-D-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 38                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Ala-Lys)-NH 2 ;                        SEQ ID NO: 38                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-β-Ala-Lys)-NH 2 ;                        SEQ ID NO: 39                Ac-Nle-c(Cys-His-D-2-Nal-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 39                Ac-Nle-c(Cys-His-D-2-Nal-Arg-Trp-Ahx-Cys)-NH 2 ;                        SEQ ID NO: 40                Ac-hPhe-c(Asp-His-D-2-Nal-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 40                Ac-Cha-c(Asp-His-D-2-Nal-Arg-Trp-Gaba-Lys)-NH 2 ;                        SEQ ID NO: 41                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-β-Ala-Lys)-OH;                        SEQ ID NO: 42                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Ahx-Cys)-OH;                        SEQ ID NO: 43                D-Phe-c(Cys-His-D-Phe-Arg-Trp-Ala-D-Cys)-Thr-OH;                        SEQ ID NO: 43                D-Phe-c(Cys-His-D-Phe-Arg-Trp-β-Ala-D-Cys)-Thr-OH;                        SEQ ID NO: 43                D-Phe-c(Cys-His-D-Phe-Arg-Trp-Gaba-D-Cys)-Thr-OH;                        SEQ ID NO: 42                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-OH;                        SEQ ID NO: 41                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Apn-Lys)-OH;                        SEQ ID NO: 44                Ac-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                        SEQ ID NO: 44                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                        SEQ ID NO: 44                Ac-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                        SEQ ID NO: 44                Ac-D-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                        SEQ ID NO: 44                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                        SEQ ID NO: 44                Ac-D-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                        SEQ ID NO: 44                Ac-hPhe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-OH;                        SEQ ID NO: 45                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Gaba-Cys)-OH;                        SEQ ID NO: 45                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Ahx-Cys)-OH;                        SEQ ID NO: 45                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-β-Ala-Cys)-OH;                        SEQ ID NO: 45                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-D-Ala-Cys)-OH;                        SEQ ID NO: 46                Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-OH;                        SEQ ID NO: 46                Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-2-Nal-Cys)-OH;                        SEQ ID NO: 46                Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-1-Nal-Cys)-OH;                        SEQ ID NO: 46                Ac-Nle-c(Cys-D-Ala-His-D-2-Nal-Arg-Bal-Cys)-OH;                        SEQ ID NO: 47                Ac-Nle-c(Pen-D-Ala-His-D-Phe-Arg-Trp-Cys)-OH;                        SEQ ID NO: 48                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Pen)-OH;                        SEQ ID NO: 49                Ac-Arg-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 50                Ac-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 50                Ac-D-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        SEQ ID NO: 51                Ac-D-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-NH 2 ;                        SEQ ID NO: 52                Ac-D-Arg-c(Cys-His-D-Phe-Arg-Trp-Gaba-Pen)-NH 2 ;                        SEQ ID NO: 52                Ac-Arg-c(Cys-His-D-Phe-Arg-Trp-Gaba-Pen)-NH 2 ;                        SEQ ID NO: 51                Ac-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-NH 2 ;                        SEQ ID NO: 53                Ac-D-Arg-c(Asp-His-D-Phe-Arg-Trp-Ala-Lys)-NH 2 ;                        SEQ ID NO: 53                Ac-Arg-c(Asp-His-D-Phe-Arg-Trp-Ala-Lys)-NH 2 ;                        SEQ ID NO: 35                Ac-Nle-c(Cys-3-Pal-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 54                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Gly-Cys)-NH 2 ;                        SEQ ID NO: 54                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-D-Ala-Cys)-NH 2 ;                        SEQ ID NO: 54                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-β-Ala-Cys)-NH 2 ;                        SEQ ID NO: 54                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Gaba-Cys)-NH 2 ;                        SEQ ID NO: 54                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Apn-Cys)-NH 2 ;                        SEQ ID NO: 55                Ac-c(Cys-Glu-His-D-Phe-Arg-Trp-Ala-Cys)-NH 2 ;                        SEQ ID NO: 55                Ac-c(Cys-Glu-His-D-Phe-Arg-2-Nal-Ala-Cys)-NH 2 ;                        SEQ ID NO: 56                Ac-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Ala-Cys)-NH 2 ;                        SEQ ID NO: 56                Ac-c(Cys-D-Ala-His-D-Phe-Arg-2-Nal-Ala-Cys)-NH 2 ;                        SEQ ID NO: 57                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Ala-Cys)-NH 2 ;                        SEQ ID NO: 57                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-β-Ala-Cys)-NH 2 ;                        SEQ ID NO: 58                Ac-Nle-c(Asp-D-Ala-His-D-Phe-Arg-Bal-Ala-Lys)-NH 2 ;                        (SEQ ID NO: 60)                Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-NH 2 ;                        (SEQ ID NO: 61)                Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -Doc-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-NH 2 ;                        (SEQ ID NO: 62)                Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-β-Ala-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 62)                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-β-Ala-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 63)                Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-(Doc) 2 -Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 64)                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-(Pro) 2 -Lys-Asp-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 65)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Gly-Cys)-(Pro) 2 -Lys-Asp-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO 66)                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-(β-Ala) 2 -Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 67)                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-(Pro) 2 -Lys-Asp-Doc-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 68)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Gly-Cys)-(Pro) 2 -Lys-Asp-Doc-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 69)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 69)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-Doc-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 70)                Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-(Doc) 2 -Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 71)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-                   (Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 72)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 73)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 74)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 75)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   Arg-Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 76)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   Gln-(Arg) 5 -NH 2 ;                    (SEQ ID NO: 77)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Lys-                   Gln-Lys-(Arg) 5 -NH 2 ;                    (SEQ ID NO: 78)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 4 -Gln-Arg-NH 2 ;                    (SEQ ID NO: 79)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Aib-Arg-(Lys) 2 -                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 80)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 80)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 81)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 82)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 82)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 81)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 83)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 84)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 83)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 85)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 3 -Gln-(Arg) 2 -NH 2 ;                    (SEQ ID NO: 86)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Gln-                   (Lys) 2 -(Arg) 5 -NH 2 ;                    (SEQ ID NO: 87)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 5 -Gln-NH 2 ;                    (SEQ ID NO: 71)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-                   (Lys) 2 -(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 71)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-(Lys) 2 -                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 88)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 2 -Lys-(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 89)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Arg-Lys-(Arg) 3 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 88)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 2 -Lys-(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 90)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 2 -                   Lys-(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 91)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-(Arg) 2 -Lys-                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 92)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-Arg-Lys-                   (Arg) 3 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 95)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 2 -                   Lys-(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 96)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Lys-                   (Arg) 3 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 97)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-(Arg) 2 -Lys-                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 92)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-Arg-Lys-                   (Arg) 3 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 98)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 2 -Lys-(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 99)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Arg-Lys-(Arg) 3 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 101)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Lys-                   (Arg) 3 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 104)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 2 -Lys-(Arg) 2 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 105)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Arg-Lys-(Arg) 3 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 100)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 2 -Lys-                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 101)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-Arg-Lys-                   (Arg) 3 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 102)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-(Arg) 2 -Lys-                   (Arg) 2 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 103)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Gly-Arg-Lys-(Arg) 3 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 113)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 113)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 114)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 114)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 115)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 115)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 116)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 116)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 118)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 118)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 119)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 120)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 120)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 121)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 121)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 122)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 6 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 122)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 6 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 124)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 6 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 125)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 125)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 126)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 126)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 127)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 6 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 127)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 6 -                   Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 128)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 128)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -                   Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 130)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 130)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 133)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 134)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 134)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 135)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-β-Ala-Tyr-Gly-(Arg) 6 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 135)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Arg-Asp-β-Ala-Tyr-Gly-(Arg) 6 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 136)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 137)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-Arg-(Lys) 2 -Arg-Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 136)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-Arg-(Lys) 2 -(Arg) 2 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 138)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 138)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 139)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 140)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 141)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 2 -Lys-(Arg) 2 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 142)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-Arg-Lys-(Arg) 3 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 141)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Gly-(Arg) 2 -Lys-(Arg) 2 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 142)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Gly-Arg-Lys-(Arg) 3 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 143)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 2 -Lys-(Arg) 2 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 144)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Arg-Lys-(Arg) 3 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 148)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 148)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 149)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2; ;                        (SEQ ID NO: 149)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 151)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 150)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 150)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 151)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 152)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 152)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 154)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 153)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 154)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 155)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 155)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 157)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 156)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 156)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 157)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 158)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 158)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 159)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 160)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 161)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Ala-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 162)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Ala-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 164)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 163)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 163)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 164)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 165)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 165)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 166)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 166)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 168)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 167)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 167)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 168)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 170)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 169)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 169)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 170)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 171)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 171)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 173)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 172)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 172)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 173)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 174)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 174)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Lys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 175)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-β-Ala-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 176)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-β-Ala-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 177)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Ahx-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 178)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Ahx-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 179)                D-Phe-c(Cys-His-D-Phe-Arg-Trp-β-Ala-D-Cys)-Thr-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 180)                D-Phe-c(Cys-His-D-Phe-Arg-Trp-β-Ala-D-Cys)-Thr-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 181)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 182)                Ac-Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 183)                Ac-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 184)                Ac-Cha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 183)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 185)                Ac-Nle-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 186)                Ac-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 185)                Ac-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 186)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 188)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 187)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 188)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 189)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 190)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 189)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 190)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 191)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 192)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 191)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 192)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 193)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 194)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                    (SEQ ID NO: 193)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 194)                Ac-hCha-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 195)                Ac-D-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 196)                Ac-D-Chg-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 197)                Ac-hPhe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 198)                Ac-hPhe-c(Asp-His-D-Phe-Arg-Trp-Gaba-Lys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 199)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Apn-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 200)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Apn-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 199)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Ahx-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 200)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-Ahx-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 201)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-β-Ala-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 202)                Ac-Nle-c(Cys-His-D-Phe-Arg-D-Trp-β-Ala-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 203)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 203)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 205)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 204)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 204)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 205)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 207)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 206)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-Doc-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 206)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 207)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 208)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 208)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 209)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 210)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 209)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-β-Ala-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 211)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 212)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 213)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 213)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(β-Ala) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 267)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 214)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 216)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 214)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-Doc-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 217)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 215)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 216)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 215)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(Doc) 2 -Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 217)                D-Phe-c(Cys-His-D-(Et)Tyr-Arg-Trp-β-Ala-D-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 218)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 219)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 218)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 219)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 221)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 220)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 221)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 222)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 223)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 222)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 223)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 224)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 225)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 224)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 225)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Trp-β-Ala-D-Cys)-Thr-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 227)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 226)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-β-Ala-Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 4 -NH 2 ;                    (SEQ ID NO: 228)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 227)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 228)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 229)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 230)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -                   NH 2 ;                    (SEQ ID NO: 232)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 231)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-                   (Arg) 3 -NH 2 ;                    (SEQ ID NO: 232)                D-Phe-c(Cys-His-D-(Et)Tyr-hArg-Bip-β-Ala-D-Cys)-Thr-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 233)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Gly-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -                   NH 2 ;                    (SEQ ID NO: 234)                Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Gly-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 235)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 236)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 235)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 236)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 237)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 238)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 237)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 238)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 239)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 240)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 239)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 240)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 241)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 242)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 241)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 242)                Nle-c(Cys-His-D-Phe-Arg-Trp-Apn-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 243)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 244)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 243)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                    (SEQ ID NO: 244)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 245)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 246)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 245)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 246)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 247)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 248)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 247)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 248)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 249)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 250)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 249)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 250)                Ac-Nle-c(Cys-D-Leu-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 251)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 252)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 251)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 252)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 253)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 254)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 253)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 254)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 255)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 256)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 255)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 256)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 257)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 258)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 257)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 258)                Ac-Nle-c(Cys-D-Cha-His-D-Phe-Arg-Trp-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 259)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 260)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 259)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 260)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 261)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 262)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-β-Ala-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 261)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(β-Ala) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 262)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(β-Ala) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 263)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 264)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-Doc-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 263)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 264)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 3 -NH 2 ;                        (SEQ ID NO: 265)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-Doc-Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 266)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-Doc-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 265)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(Doc) 2 -Tyr-Gly-(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 266)                Nle-c(Cys-His-D-Phe-Arg-Trp-Gaba-Cys)-(Doc) 2 -(Arg) 5 -Gln-(Arg) 4 -NH 2 ;                        (SEQ ID NO: 268)                Ac-c(Cys-Glu-His-D-4-Br-Phe-Arg-Trp-Gly-Cys)-(Pro) 2 -Lys-Asp-NH 2;                          (SEQ ID NO: 269)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala-Cys)-(Pro) 2 -Lys-Asp-NH 2 ;                        (SEQ ID NO: 269)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-NH 2 ;                        (SEQ ID NO: 269)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala-Cys)-(Pro) 2 -Lys-Asp-NH 2 ;                        (SEQ ID NO: 269)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)-(Pro) 2 -Lys-Asp-NH 2 ;                        (SEQ ID NO: 270)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-β-Ala-Cys)-(Pro) 2 -Lys-Asp-NH 2 ;                        (SEQ ID NO: 270)                Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Aib-Cys)-(Pro) 2 -Lys-Asp-NH 2 ;                        (SEQ ID NO: 271)                c[Hydantoin(C(O)-(Cys-D-Ala))-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 271)                c[Hydantoin(C(O)-(hCys-D-Ala))-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 272)                c[Hydantoin(C(O)-(Cys-D-Ala))-His-D-2-Nal-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 272)                c[Hydantoin(C(O)-(hCys-D-Ala))-His-D-2-Nal-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 273)                c[Hydantoin(C(O)-(Asp-D-Ala))-His-D-Phe-Arg-Trp-Lys]NH 2 ;                        (SEQ ID NO: 273)                c[Hydantoin(C(O)-(Asp-D-Ala))-His-D-Phe-Arg-Trp-Orn]-NH 2 ;                        (SEQ ID NO: 273)                c[Hydantoin(C(O)-(Asp-D-Ala))-His-D-Phe-Arg-Trp-Dab]-NH 2 ;                        (SEQ ID NO: 273)                c[Hydantoin(C(O)-(Asp-D-Ala))-His-D-Phe-Arg-Trp-Dap]-NH 2 ;                        (SEQ ID NO: 275)                c[Hydantoin(C(O)-(Asp-His))-D-2-Nal-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 274)                c[Hydantoin(C(O)-(Asp-His))-D-Phe-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 274)                c[Hydantoin(C(O)-(Asp-A3c))-D-Phe-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 274)                c[Hydantoin(C(O)-(Asp-A5c))-D-Phe-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 274)                c[Hydantoin(C(O)-(Asp-A6c))-D-Phe-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 275)                c[Hydantoin(C(O)-(Asp-A3c))-D-2-Nal-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 275)                c[Hydantoin(C(O)-(Asp-A5c))-D-2-Nal-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 275)                c[Hydantoin(C(O)-(Asp-A6c))-D-2-Nal-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 275)                c[Hydantoin (C(O)-(Asp-A5c))-D-2-Nal-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 274)                c[Hydantoin(C(O)-(Asp-Aic))-D-Phe-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 274)                c[Hydantoin(C(O)-(Asp-Apc))-D-Phe-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 275)                c[Hydantoin(C(O)-(Asp-Aic))-D-2-Nal-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 275)                c[Hydantoin(C(O)-(Asp-Apc))-D-2-Nal-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 275)                c[Hydantoin-(C(O)-(Asp-Aic))-D-2-Nal-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 275)                c[Hydantoin-(C(O)-(Asp-Apc))-D-2-Nal-Arg-Trp-Lys]-NH 2 ;                        (SEQ ID NO: 276)                c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe-Arg-Trp-Orn]-NH 2 ;                        (SEQ ID NO: 276)                c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe-Arg-Trp-Dab]-NH 2 ;                        (SEQ ID NO: 276)                c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe-Arg-Trp-Dap]-NH 2 ;                        (SEQ ID NO: 277)                c[Hydantoin(C(O)-(Glu-His))-D-Phe-Arg-Trp-Dap]-NH 2 ;                        (SEQ ID NO: 278)                Hydantoin(C(O)-(Arg-Gly))-c(Cys-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 278)                Hydantoin(C(O)-(Nle-Gly))-c(Cys-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 278)                Hydantoin(C(O)-(Gly-Gly))-c(Cys-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 279)                Hydantoin(C(O)-(Nle-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 279)                Hydantoin(C(O)-(Gly-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 280)                Hydantoin(C(O)-(Nle-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-NH 2 ;                        (SEQ ID NO: 280)                Hydantoin(C(O)-(Gly-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Pen)-NH 2 ;                        (SEQ ID NO: 279)                Hydantoin(C(O)-(Ala-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 279)                Hydantoin(C(O)-(D-Ala-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 279)                Hydantoin(C(O)-(Aib-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 279)                Hydantoin(C(O)-(Val-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 279)                Hydantoin(C(O)-(Ile-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 279)                Hydantoin(C(O)-(Leu-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 281)                Hydantoin(C(O)-(Gly-Gly))-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 281)                Hydantoin(C(O)-(Nle-Gly))-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 278)                Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 279)                Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 279)                Hydantoin(C(O)-(Arg-Gly))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 282)                Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 282)                Hydantoin(C(O)-(Arg-Gly))-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 283)                Hydantoin(C(O)-(Ala-Nle))-c(Cys-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 283)                Hydantoin(C(O)-(Val-Nle))-c(Cys-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 283)                Hydantoin(C(O)-(Gly-Nle))-c(Cys-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 284)                Hydantoin(C(O)-(A6c-Nle))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 284)                Hydantoin(C(O)-(Gly-Nle))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 284)                Hydantoin(C(O)-(Ala-Nle))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 284)                Hydantoin(C(O)-(D-Ala-Nle))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 284)                Hydantoin(C(O)-(Val-Nle))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 284)                Hydantoin(C(O)-(Leu-Nle))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 284)                Hydantoin(C(O)-(Cha-Nle))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 284)                Hydantoin(C(O)-(Aib-Nle))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 285)                Hydantoin(C(O)-(Gly-Arg))-c(Cys-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 285)                Hydantoin(C(O)-(Gly-Arg))-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 286)                Hydantoin(C(O)-(Gly-Arg))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 286)                Hydantoin(C(O)-(Gly-Arg))-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 287)                Hydantoin(C(O)-(Gly-D-Arg))-c(Cys-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 288)                Hydantoin(C(O)-(Gly-D-Arg))-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 288)                Hydantoin(C(O)-(Gly-D-Arg))-c(Cys-D-Ala-His-D-2-Nal-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 289)                Hydantoin(C(O)-(Nle-Ala))-c(Cys-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(Ala-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ,                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(Nle-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(D-Ala-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(Aib-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(Val-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(Abu-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(Leu-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(Ile-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(Cha-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(A6c-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(Phe-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 290)                c[Hydantoin(C(O)-(Gly-Cys))-D-Ala-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 291)                c[Hydantoin(C(O)-(Gly-Cys))-Glu-His-D-Phe-Arg-Trp-Cys]-NH 2 ;                        (SEQ ID NO: 292)                Ac-Tyr-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 292)                Ac-2-Nal-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 292)                Ac-1-Nal-Arg-c(Cys-D-Ala-His-DPhe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 292)                Ac-Phe-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 292)                Ac-Trp-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 292)                Ac-Pff-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                        (SEQ ID NO: 293)                H-His-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;           and                    (SEQ ID NO: 292)                Ac-His-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2 ;                
or a pharmaceutically acceptable salt thereof.
 
     In one preferred aspect, the melanocortin receptor 4 agonist useful to treat insulin resistance in the subject in need thereof, is Ac-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO:50) or a pharmaceutically acceptable salt thereof. In another preferred aspect, the melanocortin receptor 4 agonist useful to treat insulin resistance in the subject in need thereof, is Hydantoin(C(O)-(Arg-Gly))-c(Cys-Glu-His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO:278) or a pharmaceutically acceptable salt thereof. 
     In other aspects of the invention, administration of a compound or composition comprising a compound or pharmaceutical salt of a compound of the invention useful to treat insulin resistance, is continuous, hourly, four times daily, three time daily, twice daily, once daily, once every other day, twice weekly, once weekly, once every two weeks, once a month, or once every two months, or longer. 
     The subject in need of treatment may be obese, overweight, of normal weight or lean. The obese, overweight, normal weight or lean subject may suffer from type II diabetes. The preferred administration of a compound or composition comprising a compound or pharmaceutical salt of a compound of the invention useful to treat insulin resistance, is peripheral administration. Examples of peripheral administration include oral, subcutaneous, intraperitoneal, intramuscular, intravenous, rectal, transdermal or intranasal forms of administration. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1 : Food consumed in fasted rats 6 hours after administration of 100 nmole/Kg of selected compounds. 
         FIG. 2A . Effect of subcutaneous administration of 75, 300 or 1200 nmole/kg/day of Compound A upon body weight in rats. 
         FIG. 2B . Effect of subcutaneous administration of 75, 300 or 1200 nmole/kg/day of Compound A upon cumulative food intake in rats. 
         FIG. 2C . Effect of subcutaneous administration of 75, 300 or 1200 nmole/kg/day of Compound A upon insulin levels in rats. 
         FIG. 2D . Effect of subcutaneous administration of 75, 300 or 1200 nmole/kg/day of Compound A upon glucose levels in rats. 
         FIG. 3A . Effect of subcutaneous administration of 75, 300 or 1200 nmole/kg/day of Compound B upon body weight in rats. 
         FIG. 3B . Effect of subcutaneous administration of 75, 300 or 1200 nmole/kg/day of Compound B upon cumulative food intake in rats. 
         FIG. 3C . Effect of subcutaneous administration of 75, 300 or 1200 nmole/kg/day of Compound B upon insulin levels in rats. 
         FIG. 3D . Effect of subcutaneous administration of 75, 300 or 1200 nmole/kg/day of Compound B upon glucose levels in rats. 
         FIG. 4 . Effect of subcutaneous administration of 200, 600 or 1800 nmole/kg/day of Compound A upon blood glucose levels in mice. 
         FIG. 5 . Effect of intraperitoneal administration of 6.4 μmole/kg of Compound A upon blood glucose levels in obese mice. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Recent studies have reported that staggering numbers of people world wide are overweight and suffering a wide variety of serious and expensive health problems. According the World Health Organization (as reported in Kouris-Blazos et al., Asia Pac. J. Clin. Nutr., 2007, 16:329-338), an estimated 1 billion people throughout the world are overweight and an estimated 300 million of these are obese. An estimated 22 million children under the age of 5 are severely overweight and in the European Union alone, the number of children who are overweight is expected to rise by 1.3 million children per year (Kosti et al., 2006, Cent. Eur. J. Public Health, 14:151-159). Obesity, as defined by the Statistical Bulletin provided by the Metropolitan Life Insurance Co., (1959, 40:1), is a condition in which a person is approximately 20-25% over normal body weight. Alternatively, an individual is considered obese if the person has a body mass index of greater than 25% over normal or greater than 30% over normal with risk factors (see Bray et al., Diabetes/Metabolism Review, 1988, 4:653-679 or Flynn et al., Proc. Nutritional Society, 1991, 50:413). One of the main causes for obesity is the consumption of a high caloric diet (Riccardi et al., Clin. Nutr., 2004, 23:447-456). 
     Diabetes is a chronic, debilitating disease afflicting many overweight and obese people. It is estimated that 20.8 million people in the United States alone have diabetes and more than 6 million more additional cases remain undiagnosed (Cornell, Manag. Care Pharm., 2007, 13:S11-5). Type 2 diabetes (also referred to herein as type II diabetes) is a chronic disease characterized by insulin resistance, impaired insulin secretion and hyperglycemia. Worldwide, type II diabetes is believed to affect approximately 171 million people, imparting numerous microvascular and macrovascular complications resulting in morbidity and mortality (Mudaliar, Indian J. Med. Res., 2007, 125:275-296). Mudaliar further notes that despite the availability of anti-hyperglycaemic agents available, control of glucose remains elusive in many patients. 
     Insulin resistance, also referred to as reduced insulin sensitivity, is a condition in which the amount of insulin needed to clear glucose from the blood of a subject is increased as compared to the amount of insulin needed to clear the same amount of glucose from the blood of a normal, non-insulin sensitive subject. Insulin resistance is regarded as the main link between obesity and type II diabetes (see Obici et al., J. Clin. Inv., 2001, 108:1079-1085 and references therein). It is known that rats fed a high fat diet show an increase in body weight (diet-induced obesity or DIO) and a decrease in insulin sensitivity. Such DIO rats provide an animal model in which to study the mechanisms of insulin resistance due to obesity (see for example Banno et al., FEBS letters, 2007, 581:1131-1136). The size and weight of adipose tissues are increased in DIO rats and it is thought that the accompanying hypertrophy of adipocytes leads to changes in the release of adipocytokines such as leptin and adiponectin which are known to regulate insulin sensitivity; it is thought that morphological changes in adipose tissue as well as changes in plasma levels of adipocytokines are among the causes of insulin resistance in DIO rats (summarized in Banno, et al., FEBS letters, 2007, 581:1131-1136 and references therein). 
     Melanocortins are proposed to play a large role in energy metabolism and homeostasis. Melanocortins cleaved from the POMC precursor exert their effects by binding to members of the melanocortin receptor family located in the brain. The major effect of melanocortin in the brain is to reduce food intake however, it has also been shown that melanocortin agonists or antagonists injected directly into the cerebral ventricle affect insulin actions in the periphery while food was withdrawn or while food intake was kept constant (see Schwartz et al., Nature, 2000, 404:661-671; Seeley et al., Ann. Rev. Nutr., 2004, 24:133-149; Cone et al., Recent Prog. Horm. Res., 1996, 51:287-317; Heijbor et al., Diabetologia, 2005, 48:1621-1626; Obici et al., J. Clin. Inv., 2001, 108:1079-1085). Taken together, these data suggest that central administration of melanocortins affects insulin sensitivity and may do so independently of energy balance. Banno et al., (FEBS letters, 2007, 581:1131-1136) demonstrated that intracerebral injections of a melanocortin agonist to DIO rats ameliorated insulin sensitivity in the periphery, decreased the size of and increased the number of adipocytes in white adipose tissue and decreased triglycerides content in the liver. 
     Considering the large numbers of overweight and/or insulin resistant subjects in need of treatment, intracerebral administration is an unlikely means to disperse medicaments to patients. There is a need in the art, therefore, to identify melanocortin agonists and antagonists suitable for peripheral administration to affect parameters of insulin action and energy metabolism such as insulin sensitivity, cellular characteristics of white adipose tissue, triglyceride levels and the like. 
     Nomenclature and Abbreviations 
     As used herein, an “obese subject” or mammal is characterized as having a body weight approximately 20% or greater than the normal body weight for said subject. Normal body weight may be determined by a comparison of the weight of the subject at a prior point in time, such as when insulin metabolism was normal, or by a comparison of the weight of the subject as compared to averages of other subjects of a similar age and/or condition. 
     As used herein, an “overweight subject” or mammal is characterized as having a body weight approximately 5% greater to approximately 20% greater than the normal body weight for said subject. Normal body weight may be determined by a comparison of the weight of the subject at a prior point in time, such as when insulin metabolism was normal, or by a comparison of the weight of the subject as compared to averages of other subjects of a similar age and/or condition. 
     As used herein, a “normal subject” or mammal is characterized as having a body weight up to approximately 5% greater than to approximately 5% less than the normal body weight for said subject. Normal body weight may be determined by a comparison of the weight of the subject at a prior point in time, such as when insulin metabolism was normal, or by a comparison of the weight of the subject as compared to averages of other subjects of a similar age and/or condition. 
     As used herein, a “lean subject” or mammal is characterized as having a body weight approximately 5% to 30% or even to 50% less than the normal body weight for said subject. Normal body weight may be determined by a comparison of the weight of the subject at a prior point in time, such as when insulin metabolism was normal, or by a comparison of the weight of the subject as compared to averages of other subjects of a similar age and/or condition. 
     As used herein, the terms “treat”, “treating” and “treatment” include palliative, curative and prophylactic treatment. 
     As used herein, “measurable” means the biologic effect is both reproducible and significantly different from the baseline variability of the assay. 
     As used herein, peripheral administration includes all forms of administration of a compound or a composition comprising a compound of the instant invention which excludes intracranial administration. Examples of peripheral administration include, but are not limited to, oral, parenteral (e.g., intramuscular, intraperitoneal, intravenous or subcutaneous injection, implant and the like), nasal, vaginal, rectal, sublingual or topical routes of administration, including transdermal patch applications and the like. 
     A “subject”, as used herein and throughout this application, refers to a mammalian or non-mammalian animal including, for example and without limitation, a human, a rat, a mouse or farm animal. Reference to a subject does not necessarily indicate the presence of a disease or disorder. The term “subject” includes, for example, a mammalian or non-mammalian animal being dosed with a melanocortin analog as part of an experiment, a mammalian or non-mammalian animal being treated to help alleviate a disease or disorder, and a mammalian or non-mammalian animal being treated prophylactically to retard or prevent the onset of a disease or disorder. Subject mammals may be human subjects of any age, such as an infant, a child, an adult or an elderly adult. 
     A “therapeutically acceptable amount” of a compound or composition of the invention, regardless of the formulation or route of administration, is that amount which elicits a desired biological response in a subject. The biological effect of the therapeutic amount may occur at and be measured at many levels in an organism. For example, the biological effect of the therapeutic amount may occur at and be measured at the cellular level by measuring the response at a receptor which binds melanocortin and/or a melanocortin analog, or the biological effect of the therapeutic amount may occur at and be measured at the system level, such as effecting an increase/decrease in the levels of insulin. The biological effect of the therapeutic amount may occur at and be measured at the organism level, such as the alleviation of a symptom(s) or progression of a disease or condition in a subject. A therapeutically acceptable amount of a compound or composition of the invention, regardless of the formulation or route of administration, may result in one or more biological responses in a subject. In the event that the compound or composition of the invention is subject to testing in an in vitro system, a therapeutically acceptable amount of the compound or composition may be viewed as that amount which gives a measurable response in the in vitro system of choice. 
     The nomenclature used to define the peptides is that typically used in the art wherein the amino group at the N-terminus appears to the left and the carboxyl group at the C-terminus appears to the right. Where the amino acid has D and L isomeric forms, it is the L form of the amino acid that is represented unless otherwise explicitly indicated. 
     The compounds of the invention useful for the treatment of insulin resistance, with or without weight loss, may possess one or more chiral centers and so exist in a number of stereoisomeric forms. All stereoisomers and mixtures thereof are included in the scope of the present invention. Racemic compounds may either be separated using preparative HPLC and a column with a chiral stationary phase or resolved to yield individual enantiomers utilizing methods known to those skilled in the art. In addition, chiral intermediate compounds may be resolved and used to prepare chiral compounds of the invention. 
     The compounds of the invention useful for the treatment of insulin resistance, with or without weight loss, may exist in one or more tautomeric forms. All tautomers and mixtures thereof are included in the scope of the present invention. For example, a claim to 2-hydroxypyridinyl would also cover its tautomeric form, α-pyridonyl. 
     Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Also, all publications, patent applications, patents and other references mentioned herein are incorporated by reference in their entirety. 
     
       
         
               
               
             
           
               
                   
               
               
                 Symbol 
                 Meaning 
               
               
                   
               
             
             
               
                 Abu 
                 α-aminobutyric acid 
               
               
                 Ac 
                 acyl group 
               
               
                 Acc 
                 1-amino-1-cyclo(C 3 -C 6 )alkyl carboxylic acid 
               
               
                 A3c 
                 1-amino-1-cyclopropanecarboxylic acid 
               
               
                 A4c 
                 1-amino-1-cyclobutanecarboxylic acid 
               
               
                 A5c 
                 1-amino-1-cyclopentanecarboxylic acid 
               
               
                 A6c 
                 1-amino-1-cyclohexanecarboxylic acid 
               
               
                 Aha 
                 7-aminoheptanoic acid 
               
               
                 Ahx 
                 6-aminohexanoic acid 
               
               
                 Aib 
                 α-aminoisobutyric acid 
               
               
                 Aic 
                 2-aminoindan-2-carboxylic acid 
               
               
                 Ala or A 
                 alanine 
               
               
                 β-Ala 
                 βalanine 
               
               
                   
               
               
                 Apc 
                 
                   
                             
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 Apn 
                 5-aminopentanoic acid (HN—(CH2) 4 —(C(O) 
               
               
                 Arg or R 
                 arginine 
               
               
                 hArg 
                 homoarginine 
               
               
                 Asn or N 
                 asparagine 
               
               
                 Asp or D 
                 aspartic acid 
               
               
                 Bal 
                 3-benzothienylalanine 
               
               
                   
               
               
                 Bip 
                 
                   
                             
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 Bpa 
                 4-benzoylphenylalanine 
               
               
                 4-Br-Phe 
                 4-bromo-phenylalanine 
               
               
                 Cha 
                 β-cyclohexylalanine 
               
               
                 hCha 
                 homo-cyclohexylalanine 
               
               
                 Chg 
                 cyclohexylglycine 
               
               
                 Cys or C 
                 cysteine 
               
               
                 hCys 
                 homocysteine 
               
               
                 Dab 
                 2,4-diaminobutyric acid 
               
               
                 Dap 
                 2,3-diaminopropionic acid 
               
               
                 Dip 
                 β,β-diphenylalanine 
               
               
                   
               
               
                 Doc 
                 
                   
                             
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 2-Fua 
                 β-(2-furyl)-alanine 
               
               
                 Gaba 
                 4-aminobutyric acid 
               
               
                 Gln or Q 
                 glutamine 
               
               
                 Glu or E 
                 glutamic acid 
               
               
                 Gly or G 
                 glycine 
               
               
                 His or H 
                 histidine 
               
               
                 3-Hyp 
                 trans-3-hydroxy-L-proline, i.e., (2S,3S)-hydroxy- 
               
               
                   
                 pyrrolidine-2-carboxylic acid 
               
               
                 4-Hyp 
                 4-hydroxyproline, i.e, (2S,4R)-4-hydroxypyrrolidine- 
               
               
                   
                 2-carboxylic acid 
               
               
                 Ile or I 
                 isoleucine 
               
               
                 Leu or L 
                 leucine 
               
               
                 hLeu 
                 homoleucine 
               
               
                 Lys or K 
                 lysine 
               
               
                 Met or M 
                 methionine 
               
               
                 β-hMet 
                 β-homomethionine 
               
               
                 1-Nal 
                 β-(1-naphthyl)alanine: 
               
               
                 2-Nal 
                 β-(2-naphthyl)alanine 
               
               
                 Nip 
                 nipecotic acid 
               
               
                 Nle 
                 norleucine 
               
               
                 Oic 
                 octahydroindole-2-carboxylic acid 
               
               
                 Orn 
                 ornithine 
               
               
                 2-Pal 
                 β-(2-pyridyl)alanine 
               
               
                 3-Pal 
                 β-(3-pyridiyl)alanine 
               
               
                 4-Pal 
                 β-(4-pyridiyl)alanine 
               
               
                 Pen 
                 pencillamine 
               
               
                 Pff 
                 (S)-pentafluorophenylalanine 
               
               
                 Phe or F 
                 phenylalanine 
               
               
                 hPhe 
                 homophenylalanine 
               
               
                 Pro or P 
                 proline 
               
               
                 hPro 
                 homoproline 
               
               
                 Ser or S 
                 serine 
               
               
                 Tle 
                 tert-Leucine 
               
               
                 Taz 
                 β-(4-thiazolyl)alanine 
               
               
                 2-Thi 
                 β-(2-thienyl)alanine 
               
               
                 3-Thi 
                 β-(3-thienyl)alanine 
               
               
                 Thr or T 
                 threonine 
               
               
                 Trp or W 
                 tryptophan 
               
               
                 Tyr or Y 
                 tyrosine 
               
               
                   
               
               
                 D-(Et)Tyr 
                 
                   
                             
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 Val or V 
                 valine 
               
               
                   
               
             
          
         
       
     
     Certain other abbreviations used herein are defined as follows:
     Boc: tert-butyloxycarbonyl   Bzl: benzyl   DCM: dichloromethane   DIC: N, N-diisopropylcarbodiimide   DIEA: diisopropylethyl amine   Dmab: 4-{N-(1-(4,4-dimethyl-2,6-dioxocyclohexylidene)-3-methylbutyl)-amino}benzyl   DMAP: 4-(dimethylamino)pyridine   DMF dimethylformamide   DNP: 2,4-dinitrophenyl   Fm: fluorenylmethyl   Fmoc: fluorenylmethyloxycarbonyl   For: formyl   HBTU: 2-(1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate   cHex cyclohexyl   HOAT: O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate   HOBt: 1-hydroxy-benzotriazole   MBHA 4-methylbenzhydrylamine   Mmt: 4-methoxytrityl   NMP: N-methylpyrrolidone   O-tBu oxy-tert-butyl   Pbf: 2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl   PyBroP bromo-tris-pyrrolidino-phosphonium hexafluorophosphate   tBu: tert-butyl   TIS: triisopropylsilane   TOS: tosyl   Trt trityl   TFA: trifluoro acetic acid   TFFH: tetramethylfluoroforamidinium hexafluorophosphate   Z: benzyloxycarbonyl   

     Unless otherwise indicated, with the exception of the N-terminal amino acid, all abbreviations (e.g. Ala) of amino acids in this disclosure stand for the structure of —NH—C(R)(R′)—CO—, wherein R and R′ each is, independently, hydrogen or the side chain of an amino acid (e.g., R=CH 3  and R′=H for Ala), or R and R′ may be joined to form a ring system. 
     For the N-terminal amino acid, the abbreviation stands for the structure of: 
     
       
                 
         
             
             
         
      
     
     The designation “NH 2 ” in e.g., Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO:7), indicates that the C-terminus of the peptide is amidated. Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys) (SEQ ID NO:36), or alternatively Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-OH (SEQ ID NO:36), indicates that the C-terminus is the free acid. 
     “-c(Cys-Cys)-” or “-cyclo(Cys-Cys)-” denotes the structure: 
     
       
                 
         
             
             
         
      
     
     “-c(Cys-Pen)-” or “-cyclo(Cys-Pen)-” denotes the structure: 
     
       
                 
         
             
             
         
      
     
     “-c(Asp-Lys)-” or “-cyclo(Asp-Lys)-” denotes the structure: 
     
       
                 
         
             
             
         
      
     
     Applicants have devised the following shorthand used in naming the specific embodiments and/or species: 
     “HydantoinC(O)-(A a -A b )” denotes the structure: 
     
       
                 
         
             
             
         
      
     
     wherein amino acid “A a ” has the structure: 
                                
and
 
     amino acid “A b ” the structure: 
                                
For example, a compound represented as “c[Hydantoin(C(O)-(Cys-A b ))-A 1 -A 2 -A 3 -A 4 -Cys]-” would have the following the structure:
 
                                
whereas a compound represented as “c[Hydantoin(C(O)-(A b -Cys))-A 1 -A 2 -A 3 -A 4 -Cys]-” would have the structure:
 
                                
For further guidance, “c[Hydantoin(C(O)-(Asp-A b ))-A 1 -A 2 -A 3 -A 4 -Lys]-” represents the following compound:
 
                                
whereas “c[Hydantoin(C(O)-(Dap-A b ))-A 1 -A 2 -A 3 -A 4 -Asp]-” has the following formula:
 
     
       
                 
         
             
             
         
      
     
     “Acyl” refers to R″—C(O)—, where R″ is H, alkyl, substituted alkyl, heteroalkyl, substituted heteroalkyl, alkenyl, substituted alkenyl, aryl, alkylaryl, or substituted alklyaryl, and is indicated in the general formula of a particular embodiment as “Ac”. 
     “Alkyl” refers to a hydrocarbon group containing one or more carbon atoms, where multiple carbon atoms if present are joined by single bonds. The alkyl hydrocarbon group may be straight-chain or contain one or more branches or cyclic groups. 
     “Hydroxyalkyl” refers to an alkyl group wherein one or more hydrogen atoms of the hydrocarbon group are substituted with one or more hydroxy radicals, such as hydroxymethyl, hydroxyethyl, hydroxypropyl, hydroxybutyl, hydroxypentyl, hydroxyhexyl and the like. 
     “Substituted alkyl” refers to an alkyl wherein one or more hydrogen atoms of the hydrocarbon group are replaced with one or more substituents selected from the group consisting of halogen, (i.e., fluorine, chlorine, bromine, and iodine), —OH, —CN, —SH, —NH 2 , —NHCH 3 , —NO 2 , and —C 1-20  alkyl, wherein said —C 1-20  alkyl optionally may be substituted with one or more substituents selected, independently for each occurrence, from the group consisting of halogens, —CF 3 , —OCH 3 , —OCF 3 , and —(CH 2 ) 0-20 —COOH. In different embodiments 1, 2, 3 or 4 substituents are present. The presence of —(CH 2 ) 0-20 —COOH results in the production of an alkyl acid. Non-limiting examples of alkyl acids containing, or consisting of, —(CH 2 ) 0-20 —COOH include 2-norbornane acetic acid, tert-butyric acid, 3-cyclopentyl propionic acid, and the like. 
     The term “halo” encompasses fluoro, chloro, bromo and iodo. 
     “Heteroalkyl” refers to an alkyl wherein one of more of the carbon atoms in the hydrocarbon group is replaced with one or more of the following groups: amino, amido, —O—, —S— or carbonyl. In different embodiments 1 or 2 heteroatoms are present. 
     “Substituted heteroalkyl” refers to a heteroalkyl wherein one or more hydrogen atoms of the hydrocarbon group are replaced with one or more substituents selected from the group consisting of halogen, (i.e., fluorine, chlorine, bromine, and iodine), —OH, —CN, —SH, —NH 2 , —NHCH 3 , —NO 2 , and —C 1-20  alkyl, wherein said —C 1-20  alkyl optionally may be substituted with one or more substituents selected, independently for each occurrence, from the group consisting of halogens, —CF 3 , —OCH 3 , —OCF 3 , and —(CH 2 ) 0-20 —COOH. In different embodiments 1, 2, 3 or 4 substituents are present. 
     “Alkenyl” refers to a hydrocarbon group made up of two or more carbons where one or more carbon-carbon double bonds are present. The alkenyl hydrocarbon group may be straight-chain or contain one or more branches or cyclic groups. 
     “Substituted alkenyl” refers to an alkenyl wherein one or more hydrogens are replaced with one or more substituents selected from the group consisting of halogen (i.e., fluorine, chlorine, bromine, and iodine), —OH, —CN, —SH, —NH 2 , —NHCH 3 , —NO 2 , and —C 1-20  alkyl, wherein said —C 1-20  alkyl optionally may be substituted with one or more substituents selected, independently for each occurrence, from the group consisting of halogens, —CF 3 , —OCH 3 , —OCF 3 , and —(CH 2 ) 0-20 —COOH. In different embodiments 1, 2, 3 or 4 substituents are present. 
     “Aryl” refers to an optionally substituted aromatic group with at least one ring having a conjugated pi-electron system, containing up to three conjugated or fused ring systems. Aryl includes carbocyclic aryl, heterocyclic aryl and biaryl groups. Preferably, the aryl is a 5- or 6-membered ring. Preferred atoms for a heterocyclic aryl are one or more sulfur, oxygen, and/or nitrogen. Non-limiting examples of aryl include phenyl, 1-naphthyl, 2-naphthyl, indole, quinoline, 2-imidazole, 9-anthracene, and the like. Aryl substituents are selected from the group consisting of —C 1-20  alkyl, —C 1-20  alkoxy, halogen (i.e., fluorine, chlorine, bromine, and iodine), —OH, —CN, —SH, —NH 2 , —NO 2 , —C 1-20  alkyl substituted with halogens, —CF 3 , —OCF 3 , and —(CH 2 ) 0-20 —COOH. In different embodiments the aryl contains 0, 1, 2, 3, or 4 substituents. 
     “Alkylaryl” refers to an “alkyl” joined to an “aryl”. 
     The term “(C 1 -C 12 )hydrocarbon moiety” encompasses alkyl, alkenyl and alkynyl and in the case of alkenyl and alkynyl there is C 2 -C 12 . 
     For the avoidance of doubt, unless otherwise indicated, the term substituted means substituted by one or more defined groups. In the case where groups may be selected from a number of alternative groups, the selected groups may be the same or different. For the avoidance of doubt, the term independently means that where more than one substituent is selected from a number of possible substituents, those substituents may be the same or different. 
     The pharmaceutically acceptable salts of the compounds of the invention which contain a basic centre are, for example, non-toxic acid addition salts formed with inorganic acids such as hydrochloric, hydrobromic, hydroiodic, sulfuric and phosphoric acid, with carboxylic acids or with organo-sulfonic acids. Examples include the HCl, HBr, HI, sulfate or bisulfate, nitrate, phosphate or hydrogen phosphate, acetate, benzoate, succinate, saccharate, fumarate, maleate, lactate, citrate, tartrate, gluconate, camsylate, methanesulfonate, ethanesulfonate, benzenesulfonate, p-toluenesulfonate and pamoate salts. Compounds of the invention can also provide pharmaceutically acceptable metal salts, in particular non-toxic alkali and alkaline earth metal salts, with bases. Examples include the sodium, potassium, aluminum, calcium, magnesium, zinc and diethanolamine salts (Berge, S. M. et al.,  J. Pharm. Sci.,  66:1-19 (1977); Gould, P. L.,  Intl J. Pharmaceutics,  33:201-17 (1986); and Bighley, L. D. et al.,  Encyclo. Pharma. Tech ., Marcel Dekker Inc, New York, 13:453-97 (1996). 
     The pharmaceutically acceptable solvates of the compounds of the invention include the hydrates thereof. Also included within the scope of the invention and various salts of the invention are polymorphs thereof. Hereinafter, compounds their pharmaceutically acceptable salts, their solvates or polymorphs, defined in any aspect of the invention (except intermediate compounds in chemical processes) are referred to as “compounds of the invention”. 
     In Vitro Studies 
     Compounds of the present invention can be and were tested for activity as ligands of one or more of the melanocortin receptors according to the following procedures. One skilled in the art would know that procedures similar to those described herein may be used to assay the binding activities of the compounds of the invention to melanocortin receptor molecules. 
     Radioligand Binding Assays 
     Cellular membranes used for the in vitro receptor binding assays were obtained from transgenic CHO-K1 cells stably expressing hMC-R receptor subtypes 1, 3, 4 or 5. The CHO-K1 cells expressing the desired hMC-R receptor type were sonicated (Branson® setting 7, approximately 30 sec) in ice-cold 50 mM Tris-HCl at pH 7.4 and then centrifuged at 39,000 g for 10 minutes at approximately 4° C. The pellets were resuspended in the same buffer and centrifuged at 50,000 g for 10 minutes at approximately 4° C. The washed pellets containing the cellular membranes were stored at approximately −80° C. 
     Competitive inhibition of [ 125 I](Tyr 2 )-(Nle 4 -D-Phe 7 )α-MSH ([ 125 I]-NDP-α-MSH, Amersham Biosciences®) binding was carried out in polypropylene 96 well plates. Cell membranes (1-10 g protein/well) prepared as described above were incubated in 50 mM Tris-HCl at pH 7.4 containing 0.2% bovine serum albumin (BSA), 5 mM MgCl 2 , 1 mM CaCl 2  and 0.1 mg/mL bacitracin, with increasing concentrations of the test compound and 0.1-0.3 nM [ 125 I]-NDP-α-MSH for approximately 90-120 minutes at approximately 37° C. Bound [ 125 I]-NDP-α-MSH ligand was separated from free [ 125 I]-NDP-α-MSH by filtration through GF/C glass fiber filter plates (Unifilter®; Packard) presoaked with 0.1% (w/v) polyethylenimine (PEI), using a Packard Filtermate® harvester. Filters were washed three times with 50 mM Tris-HCl at pH 7.4 at a temperature of approximately 0-4° C. and then assayed for radioactivity using a Packard Topcount® scintillation counter. Binding data were analyzed by computer-assisted non-linear regression analysis (XL fit; IDBS). A selection of the preferred embodiments was tested using the above-discussed assay and the binding constants (Ki in nM) are reported in Tables 5, 6, 7 and 8. 
     
       
         
               
             
               
               
               
               
               
               
               
             
               
             
               
               
               
               
               
               
               
             
               
             
               
               
               
               
               
               
               
             
           
               
                 TABLE 5 
               
               
                   
               
               
                 Radioligand Binding Assay Data for Selected Compounds 
               
               
                   
               
             
             
               
                 Table 5A 
               
             
          
           
               
                   
                   
                   
                   
                   
                 Ki 
                   
               
               
                   
                 Ki 
                 Ki 
                 Ki 
                 Ki 
                 hMC1-R/ 
                 SEQ ID 
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 hMC4-R 
                 hMC5-R 
                 MC4-R 
                 NO: 
               
               
                   
               
               
                 Ac-Arg-c(Cys-D-Ala-His-D- 
                 3.87 
                 10.1 
                 2.09 
                 430 
                 1.9 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 50 
               
               
                   
               
               
                 Ac-D-Arg-c(Cys-D-Ala-His- 
                 4.01 
                 12.1 
                 1.76 
                 352 
                 2.3 
                 SEQ ID 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 50 
               
               
                   
               
               
                 Ac-D-Arg-c(Cys-D-Ala-His- 
                 8.29 
                 13.3 
                 2.78 
                 816 
                 3.0 
                 SEQ ID 
               
               
                 D-Phe-Arg-Trp-Pen)-NH 2   
                   
                   
                   
                   
                   
                 NO: 51 
               
               
                   
               
               
                 Ac-D-Arg-c(Cys-His-D-Phe- 
                 3.93 
                 172 
                 11.0 
                 538 
                 0.36 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Pen)-NH 2   
                   
                   
                   
                   
                   
                 NO: 52 
               
               
                   
               
               
                 Ac-Arg-c(Cys-His-D-Phe- 
                 1.81 
                 20.5 
                 4.57 
                 502 
                 0.4 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Pen)-NH 2   
                   
                   
                   
                   
                   
                 NO: 52 
               
               
                   
               
               
                 Ac-Arg-c(Cys-D-Ala-His-D- 
                 9.67 
                 22.0 
                 4.2 
                 1900 
                 2.3 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Pen)-NH 2   
                   
                   
                   
                   
                   
                 NO: 51 
               
               
                   
               
               
                 Ac-D-Arg-c(Asp-His-D- 
                 0.79 
                 45.5 
                 1.21 
                 493 
                 0.6 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Ala-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 53 
               
               
                   
               
               
                 Ac-Arg-c(Asp-His-D-Phe- 
                 0.68 
                 20.7 
                 1.01 
                 783 
                 0.7 
                 SEQ ID 
               
               
                 Arg-Trp-Ala-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 53 
               
               
                   
               
             
          
           
               
                 Table 5B 
               
             
          
           
               
                   
                   
                   
                   
                   
                 Ki 
                   
               
               
                   
                 Ki 
                 Ki 
                 Ki 
                 Ki 
                 hMC1-R/ 
                 SEQ ID 
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 hMC4-R 
                 hMC5-R 
                 MC4-R 
                 NO: 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 114 
                 63.9 
                 3.07 
                 1657 
                 37.1 
                 SEQ ID 
               
               
                 2-Nal-Arg-1-Nal-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 16 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 11 
                 26 
                 7.6 
                 1800 
                 1.4 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 7 
               
               
                   
               
               
                 D-Phe-c(Cys-His-D-(Et)Tyr- 
                 0.05 
                 9.3 
                 1.1 
                 2.9 
                 0.0 
                 SEQ ID 
               
               
                 Arg-Trp-β-Ala-D-Cys)-Thr- 
                   
                   
                   
                   
                   
                 NO: 24 
               
               
                 NH 2   
               
               
                   
               
               
                 Nle-c(Cys-His-D-Phe-Arg- 
                 0.07 
                 4.1 
                 0.85 
                 8.8 
                 0.1 
                 SEQ ID 
               
               
                 Trp-Apn-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 27 
               
               
                   
               
               
                 Ac-Nle-c(Cys-His-D-Phe- 
                 0.12 
                 10 
                 0.43 
                 0.42 
                 0.3 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Pen)-NH 2   
                   
                   
                   
                   
                   
                 NO: 32 
               
               
                   
               
               
                 Nle-c(Cys-His-D-Phe-Arg- 
                 0.05 
                 1.3 
                 0.47 
                 0.2 
                 0.1 
                 SEQ ID 
               
               
                 Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 34 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-Phe- 
                 0.0996 
                 9318 
                 0.617 
                 10.9 
                 0.16 
                 SEQ ID 
               
               
                 Arg-Trp-β-Ala-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 1 
               
               
                   
               
               
                 Ac-Nle-c(Cys-His-D-Phe- 
                 .0132 
                 16.1 
                 1.23 
                 0.359 
                 0.11 
                 SEQ ID 
               
               
                 Arg-Trp-Ahx-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 2 
               
               
                   
               
               
                 D-Phe-c(Cys-His-D-Phe- 
                 0.207 
                 43.2 
                 2.58 
                 344 
                 0.08 
                 SEQ ID 
               
               
                 Arg-Trp-β-Ala-D-Cys)-Thr- 
                   
                   
                   
                   
                   
                 NO: 3 
               
               
                 NH 2   
               
               
                   
               
               
                 D-Phe-c(Cys-His-D-Phe- 
                 0.420 
                 106 
                 4.75 
                 1260 
                 0.09 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-D-Cys)-Thr- 
                   
                   
                   
                   
                   
                 NO: 3 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Cys-His-D-Phe- 
                 0.0951 
                 9.33 
                 0.894 
                 13.4 
                 0.11 
                 SEQ ID 
               
               
                 Arg-Trp-Apn-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 2 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-Phe- 
                 0.999 
                 300 
                 11.1 
                 431 
                 0.09 
                 SEQ ID 
               
               
                 Arg-Trp-Apn-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 4 
               
               
                   
               
               
                 Ac-Cha-c(Asp-His-D-Phe- 
                 0.106 
                 11.8 
                 1.49 
                 110 
                 0.07 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 6 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-Phe- 
                 0.0506 
                 9.89 
                 1.04 
                 16.3 
                 0.05 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 6 
               
               
                   
               
               
                 Ac-Chg-c(Asp-His-D-Phe- 
                 0.884 
                 223 
                 22.5 
                 609 
                 0.04 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 11 
               
               
                   
               
               
                 Ac-hCha-c(Asp-His-D-Phe- 
                 0.721 
                 93.5 
                 56.0 
                 747 
                 0.01 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 11 
               
               
                   
               
               
                 Ac-D-Chg-c(Asp-His-D- 
                 0.227 
                 14.5 
                 2.99 
                 164 
                 0.08 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Gaba-Lys)- 
                   
                   
                   
                   
                   
                 NO: 11 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-hPhe-c(Asp-His-D-Phe- 
                 0.277 
                 25.2 
                 3.37 
                 203 
                 0.08 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 11 
               
               
                   
               
               
                 Ac-Nle-c(Cys-His-D-Phe- 
                 0.323 
                 14.1 
                 1.96 
                 24.0 
                 0.16 
                 SEQ ID 
               
               
                 Arg-D-Trp-β-Ala-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 15 
               
               
                   
               
               
                 Ac-Nle-c(Pen-D-Ala-His-D- 
                 34.1 
                 118 
                 17.0 
                 5560 
                 2.01 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 21 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 29.1 
                 22.8 
                 3.84 
                 2550 
                 7.58 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Pen)-NH 2   
                   
                   
                   
                   
                   
                 NO: 22 
               
               
                   
               
               
                 D-Phe-c(Cys-His-D-Phe- 
                 0.442 
                 123 
                 10.3 
                 521 
                 0.04 
                 SEQ ID 
               
               
                 hArg-Trp-β-Ala-D-Cys)- 
                   
                   
                   
                   
                   
                 NO: 23 
               
               
                 Thr-NH 2   
               
               
                   
               
               
                 D-Phe-c(Cys-His-D-Phe- 
                 5.80 
                 3370 
                 583 
                 1130 
                 0.01 
                 SEQ ID 
               
               
                 Arg-Bip-β-Ala-D-Cys)-Thr- 
                   
                   
                   
                   
                   
                 NO: 25 
               
               
                 NH 2   
               
               
                   
               
               
                 D-Phe-c(Cys-His-D-(Et)Tyr- 
                 0.0567 
                 31.4 
                 14.7 
                 9.27 
                 0 
                 SEQ ID 
               
               
                 hArg-Trp-β-Ala-D-Cys)- 
                   
                   
                   
                   
                   
                 NO: 24 
               
               
                 Thr-NH 2   
               
               
                   
               
               
                 D-Phe-c(Cys-His-D-Phe- 
                 1.68 
                 1260 
                 172 
                 1220 
                 0.01 
                 SEQ ID 
               
               
                 hArg-Bip-β-Ala-D-Cys)- 
                   
                   
                   
                   
                   
                 NO: 26 
               
               
                 Thr-NH 2   
               
               
                   
               
               
                 D-Phe-c(Cys-His-D-(Et)Tyr- 
                 0.128 
                 85.6 
                 36.9 
                 38.0 
                 0 
                 SEQ ID 
               
               
                 hArg-Bip-β-Ala-D-Cys)- 
                   
                   
                   
                   
                   
                 NO: 26 
               
               
                 Thr-NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 0.352 
                 149 
                 3.01 
                 339 
                 0.12 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Gly-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 54 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 3.93 
                 876 
                 48.0 
                 4940 
                 0.08 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-D-Ala-Cys)- 
                   
                   
                   
                   
                   
                 NO: 54 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 0.995 
                 287 
                 4.80 
                 766 
                 0.21 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-β-Ala-Cys)- 
                   
                   
                   
                   
                   
                 NO: 54 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 0.848 
                 184 
                 3.76 
                 956 
                 0.23 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Gaba-Cys)- 
                   
                   
                   
                   
                   
                 NO: 54 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 1.10 
                 228 
                 7.58 
                 859 
                 0.15 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Apn-Cys)- 
                   
                   
                   
                   
                   
                 NO: 54 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Asp-D-Ala-His-D- 
                 0.659 
                 98.9 
                 2.55 
                 4.19 
                 0.26 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 28 
               
               
                   
               
               
                 Ac-Nle-c(Asp-D-Ala-His-D- 
                 4.12 
                 445 
                 50.6 
                 4300 
                 0.08 
                 SEQ ID 
               
               
                 Phe-Arg-Bal-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 28 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-Phe- 
                 111 
                 1710 
                 47.7 
                 694 
                 2.33 
                 SEQ ID 
               
               
                 Arg-Trp-Ala-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 55 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-Phe- 
                 262 
                 2500 
                 96.4 
                 1460 
                 2.72 
                 SEQ ID 
               
               
                 Arg-2-Nal-Ala-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 55 
               
               
                   
               
               
                 Ac-c(Cys-D-Ala-His-D-Phe- 
                 199 
                 5990 
                 96.7 
                 &gt;10000 
                 2.06 
                 SEQ ID 
               
               
                 Arg-Trp-Ala-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 56 
               
               
                   
               
               
                 Ac-c(Cys-D-Ala-His-D-Phe- 
                 132 
                 4560 
                 40.7 
                 8810 
                 3.24 
                 SEQ ID 
               
               
                 Arg-2-Nal-Ala-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 56 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 9.12 
                 1130 
                 22.1 
                 2860 
                 0.41 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Ala-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 57 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 1.00 
                 227 
                 5.55 
                 496 
                 0.18 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-β-Ala-Cys)- 
                   
                   
                   
                   
                   
                 NO: 57 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 0.536 
                 169 
                 3.12 
                 358 
                 0.17 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Gaba-Cys)- 
                   
                   
                   
                   
                   
                 NO: 57 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 32.1 
                 330 
                 17.4 
                 165 
                 1.84 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Pen)-OH 
                   
                   
                   
                   
                   
                 NO: 29 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Abu-His- 
                 10.6 
                 41.1 
                 7.69 
                 54.9 
                 1.38 
                 SEQ ID 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 30 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Val-His-D- 
                 13.0 
                 104 
                 10.1 
                 40 
                 1.29 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 30 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ile-His-D- 
                 4.28 
                 38.5 
                 9.0 
                 12.5 
                 0.48 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 30 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Leu-His-D- 
                 1.60 
                 6.82 
                 4.13 
                 5.57 
                 0.39 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 30 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Tle-His-D- 
                 12.0 
                 85.8 
                 11.2 
                 40 
                 1.07 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 30 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Cha-His-D- 
                 0.353 
                 2.08 
                 1.41 
                 0.857 
                 0.25 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 30 
               
               
                   
               
               
                 Ac-Nle-c(Pen-His-D-Phe- 
                 0.537 
                 86.1 
                 5.89 
                 2.56 
                 0.09 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 31 
               
               
                   
               
               
                 Ac-Nle-c(Pen-His-D-Phe- 
                 0.744 
                 178 
                 3.51 
                 2.69 
                 0.21 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Pen)-NH 2   
                   
                   
                   
                   
                   
                 NO: 32 
               
               
                   
               
               
                 Ac-Leu-c(Cys-His-D-Phe- 
                 0.216 
                 17.4 
                 0.995 
                 0.486 
                 0.22 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 33 
               
               
                   
               
               
                 Ac-Cha-c(Cys-His-D-Phe- 
                 0.107 
                 9.11 
                 0.884 
                 0.354 
                 0.12 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 33 
               
               
                   
               
               
                 Ac-Ile-c(Cys-His-D-Phe- 
                 0.148 
                 13.9 
                 1.06 
                 0.423 
                 0.14 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 33 
               
               
                   
               
               
                 Ac-Phe-c(Cys-His-D-Phe- 
                 0.254 
                 18.5 
                 2.13 
                 0.714 
                 0.12 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 33 
               
               
                   
               
               
                 Ac-Val-c(Cys-His-D-Phe- 
                 0.256 
                 29.9 
                 1.98 
                 0.864 
                 0.13 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 33 
               
               
                   
               
               
                 Ac-2-Nal-c(Cys-His-D-Phe- 
                 0.560 
                 39.2 
                 2.94 
                 2.73 
                 0.19 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 33 
               
               
                   
               
               
                 Phe-c(Cys-His-D-Phe-Arg- 
                 0.186 
                 15.2 
                 4.93 
                 0.537 
                 0.04 
                 SEQ ID 
               
               
                 Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 34 
               
               
                   
               
               
                 Ac-Nle-c(Cys-3-Pal-D-Phe- 
                 21.1 
                 151 
                 10.4 
                 92.6 
                 2.03 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 35 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 30.7 
                 152 
                 15.6 
                 114 
                 1.97 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Cys)-OH 
                   
                   
                   
                   
                   
                 NO: 36 
               
               
                   
               
               
                 Ac-Nle-c(Cys-His-Phe-Arg- 
                 5.20 
                 150 
                 138 
                 20.3 
                 0.04 
                 SEQ ID 
               
               
                 D-Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 37 
               
               
                   
               
               
                 Ac-Nle-c(Asp-D-Ala-His-D- 
                 4.89 
                 290 
                 21.3 
                 11.1 
                 0.23 
                 SEQ ID 
               
               
                 Phe-Arg-Bal-Ala-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 58 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 25.5 
                 3.82 
                 7.61 
                 102 
                 3.35 
                 SEQ ID 
               
               
                 2-Nal-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 16 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 32.5 
                 5.85 
                 2.53 
                 94.6 
                 12.85 
                 SEQ ID 
               
               
                 2-Nal-Arg-2-Nal-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 16 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D- 
                 22.2 
                 12.7 
                 16.6 
                 125 
                 1.34 
                 SEQ ID 
               
               
                 2-Nal-Arg-Bal-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 20 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal- 
                 1.17 
                 1.56 
                 0.277 
                 3.24 
                 4.22 
                 SEQ ID 
               
               
                 Arg-Trp-Ala-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 38 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal- 
                 0.648 
                 2.78 
                 0.329 
                 1.4 
                 1.97 
                 SEQ ID 
               
               
                 Arg-Trp-β-Ala-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 38 
               
               
                   
               
               
                 Ac-Nle-c(Cys-His-D-2-Nal- 
                 0.393 
                 1.86 
                 0.375 
                 1.11 
                 1.05 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 39 
               
               
                   
               
               
                 Ac-Nle-c(Cys-His-D-2-Nal- 
                 0.333 
                 2.91 
                 0.998 
                 0.366 
                 0.33 
                 SEQ ID 
               
               
                 Arg-Trp-Ahx-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 39 
               
               
                   
               
               
                 Ac-hPhe-c(Asp-His-D-2- 
                 0.461 
                 2.45 
                 0.931 
                 1.37 
                 0.50 
                 SEQ ID 
               
               
                 Nal-Arg-Trp-Gaba-Lys)- 
                   
                   
                   
                   
                   
                 NO: 40 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Cha-c(Asp-His-D-2-Nal- 
                 0.576 
                 3.98 
                 2.82 
                 3.91 
                 0.20 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 40 
               
               
                   
               
             
          
           
               
                 Table 5C 
               
             
          
           
               
                   
                   
                   
                   
                   
                 Ki 
                   
               
               
                   
                 Ki 
                 Ki 
                 Ki 
                 Ki 
                 hMC1-R/ 
                 SEQ ID 
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 hMC4-R 
                 hMC5-R 
                 MC4-R 
                 NO: 
               
               
                   
               
               
                 Ac-Arg-c(Cys-D-Ala-His-D- 
                 17.9 
                 1.68 
                 0.256 
                 23.4 
                 69.9 
                 SEQ ID 
               
               
                 2-Nal-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 49 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
             
               
             
               
               
               
               
               
             
           
               
                 TABLE 6 
               
               
                   
               
             
             
               
                 Radioligand Binding Assay Data for Selected Compounds 
               
               
                   
               
               
                 Table 6A 
               
             
          
           
               
                   
                 Ki 
                 Ki 
                 Ki 
                 Ki 
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 hMC4-R 
                 hMC5-R 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 49.9 
                 9.00 
                 0.569 
                 218 
               
               
                 Cys)-Pro-Pro-Lys-Asp-NH 2  (SEQ ID NO: 269) 
               
               
                   
               
               
                 Tyr-Gly-Arg-Lys-Lys-Arg-Arg-Gln-Arg-Arg- 
                 11.9 
                 38.1 
                 5.70 
                 11.8 
               
               
                 Arg-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)- 
               
               
                 NH 2  (SEQ ID NO: 60) 
               
               
                   
               
               
                 Tyr-Gly-Arg-Lys-Lys-Arg-Arg-Gln-Arg-Arg- 
                 3.46 
                 16.6 
                 6.65 
                 4.88 
               
               
                 Arg-Doc-Nle-c(Asp-His-D-2-Nal-Arg-Trp- 
               
               
                 Lys)-NH 2  (SEQ ID NO: 61) 
               
               
                   
               
               
                 Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-β-Ala- 
                 0.614 
                 5.09 
                 2.31 
                 3.23 
               
               
                 Tyr-Gly-Arg-Lys-Lys-Arg-Arg-Gln-Arg-Arg- 
               
               
                 Arg-NH 2  (SEQ ID NO: 62) 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-β- 
                 1.56 
                 14.1 
                 5.17 
                 7.12 
               
               
                 Ala-Tyr-Gly-Arg-Lys-Lys-Arg-Arg-Gln-Arg- 
               
               
                 Arg-Arg-NH 2  (SEQ ID NO: 62) 
               
               
                   
               
               
                 H-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-Doc- 
                 1.10 
                 1.58 
                 6.00 
                 0.629 
               
               
                 Doc-Tyr-Gly-Arg-Lys-Lys-Arg-Arg-Gln-Arg- 
               
               
                 Arg-Arg-NH 2  (SEQ ID NO: 63) 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)- 
                 0.0868 
                 0.751 
                 0.0944 
                 0.147 
               
               
                 Pro-Pro-Lys-Asp-Tyr-Gly-Arg-Lys-Lys-Arg- 
               
               
                 Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 64) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Gly- 
                 1.66 
                 4.80 
                 0.250 
                 9.62 
               
               
                 Cys)-Pro-Pro-Lys-Asp-Tyr-Gly-Arg-Lys-Lys- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 65) 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-β- 
                 0.0452 
                 0.298 
                 0.169 
                 0.386 
               
               
                 Ala-β-Ala-Tyr-Gly-Arg-Lys-Lys-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 66) 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)- 
                 0.0808 
                 0.396 
                 0.0747 
                 0.311 
               
               
                 Pro-Pro-Lys-Asp-Doc-Tyr-Gly-Arg-Lys-Lys- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 67) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Gly- 
                 4.41 
                 4.23 
                 0.455 
                 12.9 
               
               
                 Cys)-Pro-Pro-Lys-Asp-Doc-Tyr-Gly-Arg-Lys- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 68) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 1.25 
                 0.661 
                 0.292 
                 5.94 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 71) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 1.89 
                 0.546 
                 0.166 
                 6.06 
               
               
                 Cys)-Pro-Pro-Lys-Asp-Doc-Tyr-Gly-Arg-Lys- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 71) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 87.8 
                 9.08 
                 1.20 
                 359 
               
               
                 Cys)-Pro-Pro-Lys-Asp-NH 2  (SEQ ID NO: 269) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 124 
                 17.8 
                 1.11 
                 348 
               
               
                 Cys)-Pro-Pro-Lys-Asp-NH 2  (SEQ ID NO: 269) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 163 
                 23.0 
                 0.586 
                 844 
               
               
                 Pro-Pro-Lys-Asp-NH 2  (SEQ ID NO: 269) 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)- 
                 0.144 
                 0.352 
                 0.0845 
                 0.415 
               
               
                 Doc-Doc-Tyr-Gly-Arg-Lys-Lys-Arg-Arg-Gln- 
               
               
                 Arg-Arg-Arg-NH 2  (SEQ ID NO: 701) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 1.74 
                 0.590 
                 0.170 
                 4.38 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 71) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 3.86 
                 4.97 
                 0.192 
                 38.3 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg-Arg- 
               
               
                 Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 83) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 12.8 
                 15.9 
                 0.950 
                 165 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 73) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 3.07 
                 4.05 
                 0.498 
                 31.1 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg-Arg- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 74) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 0.792 
                 0.570 
                 0.162 
                 4.18 
               
               
                 Cys)-Pro-Pro-Lys-Asp-βAla-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Gln-Arg-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 75) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 0.726 
                 0.474 
                 0.209 
                 5.12 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Gln-Arg-Arg-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 76) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 0.857 
                 0.580 
                 0.209 
                 4.42 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Gln-Lys-Arg-Arg-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 77) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 0.813 
                 0.675 
                 0.269 
                 4.20 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Arg-Arg-Gln-Arg-NH 2   
               
               
                 (SEQ ID NO: 78) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 7.84 
                 10.2 
                 0.783 
                 91.8 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Tyr-Aib-Arg-Lys- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 79) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 2.93 
                 9.07 
                 0.293 
                 59.0 
               
               
                 Cys)-Pro-Pro-Arg-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 80) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 2.42 
                 6.56 
                 0.238 
                 41.7 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 80) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 6.66 
                 19.3 
                 0.819 
                 88.8 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 81) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 2.63 
                 2.09 
                 0.0737 
                 11.6 
               
               
                 Cys)-Pro-Pro-Arg-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 82) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 2.48 
                 1.21 
                 0.209 
                 9.17 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 82) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 3.65 
                 2.26 
                 0.261 
                 12.1 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 81) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 7.32 
                 11.0 
                 0.659 
                 78.0 
               
               
                 Pro-Pro-Arg-Asp-β-Ala-Arg-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2 (SEQ ID 
               
               
                 NO: 83) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 4.11 
                 7.26 
                 0.302 
                 48.3 
               
               
                 Pro-Pro-Arg-Asp-β-Ala-Arg-Arg-Arg-Arg- 
               
               
                 Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 84) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 6.77 
                 14.3 
                 0.781 
                 84.0 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2 (SEQ ID 
               
               
                 NO: 283) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 3.04 
                 3.22 
                 0.230 
                 3.85 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Arg-Gln-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 2685) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 3.24 
                 2.66 
                 0.208 
                 5.96 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Gln-Lys-Lys-Arg-Arg-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 86) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 1.58 
                 1.43 
                 0.275 
                 2.97 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Arg-Arg-Arg-Gln-NH 2   
               
               
                 (SEQ ID NO: 87) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 4.59 
                 6.28 
                 0.588 
                 22.6 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 71) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 6.46 
                 5.22 
                 0.380 
                 15.3 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg-Lys- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 71) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 4.62 
                 5.68 
                 0.505 
                 45.3 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Lys- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 88) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 2.12 
                 3.99 
                 0.352 
                 27.5 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Lys-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 89) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 3.41 
                 0.975 
                 0.549 
                 11.3 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Lys- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 88) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 4.18 
                 1.12 
                 0.223 
                 15.3 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Arg-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 90) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 2.71 
                 0.732 
                 0.202 
                 5.53 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Arg- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 91) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 5.66 
                 1.40 
                 0.446 
                 6.23 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Lys- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 92) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.211 
                 0.665 
                 0.635 
                 118 
               
               
                 Cys)-(Doc)2-Tyr-Gly-Arg-Lys-Lys-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 136) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.351 
                 0.891 
                 0.503 
                 102 
               
               
                 Cys)-β-Ala-Tyr-Gly-Arg-Lys-Lys-Arg-Gln- 
               
               
                 Arg-Arg-Arg-Arg-NH 2  (SEQ ID NO: 137) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.209 
                 0.699 
                 0.596 
                 137 
               
               
                 Cys)-Doc-Tyr-Gly-Arg-Lys-Lys-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2 (SEQ ID NO: 136) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.439 
                 1.52 
                 0.476 
                 115 
               
               
                 Cys)-β-Ala-Gly-Arg-Arg-Arg-Arg-Arg-Gln- 
               
               
                 Arg-Arg-Arg-NH 2 (SEQ ID NO: 138) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.821 
                 2.50 
                 0.700 
                 148 
               
               
                 Cys)-β-Ala-Arg-Arg-Arg-Arg-Arg-Gln-Arg- 
               
               
                 Arg-Arg-NH 2 (SEQ ID NO: 138) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.406 
                 1.11 
                 0.602 
                 131 
               
               
                 Cys)-β-Ala-Tyr-Gly-Arg-Arg-Arg-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 139) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 1.27 
                 4.63 
                 1.51 
                 220 
               
               
                 Cys)-β-Ala-Gly-Arg-Arg-Arg-Arg-Arg-Gln- 
               
               
                 Arg-Arg-Arg-Arg-NH 2  (SEQ ID NO: 139) 
               
               
                   
               
             
          
           
               
                 Table 6B 
               
             
          
           
               
                   
                 Ki 
                 Ki 
                 Ki 
                 Ki 
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 hMC4-R 
                 hMC5-R 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-β-Ala- 
                 2058 
                 113 
                 10.7 
                 239 
               
               
                 Cys)-Pro-Pro-Lys-Asp-NH 2  (SEQ ID NO: 270) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Aib- 
                 1818 
                 306 
                 5.87 
                 979 
               
               
                 Cys)-Pro-Pro-Lys-Asp-NH 2  (SEQ ID NO: 270) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 1.75 
                 1.74 
                 0.15 
                 16.8 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Arg-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 95) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 1.50 
                 1.61 
                 0.301 
                 10.4 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 96) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 1.81 
                 2.08 
                 0.305 
                 19.3 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Arg- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 97) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 2.69 
                 2.59 
                 0.243 
                 19.2 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Lys- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 92) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 2.25 
                 0.62 
                 0.303 
                 2.77 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Lys-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 99) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 1.49 
                 0.604 
                 0.865 
                 3.13 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Arg-Arg-Arg-Gln-Arg-Arg-Arg- 
               
               
                 NH 2 (SEQ ID NO: 101) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 3.28 
                 1.95 
                 0.575 
                 15.5 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Arg-Lys-Arg-Arg- 
               
               
                 Arg-Gln-Arg-Arg-Arg-NH 2 (SEQ ID NO: 105) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 2.24 
                 1.57 
                 0.437 
                 16.4 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg-Arg- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 100) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 2.14 
                 1.12 
                 0.624 
                 11.9 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg-Lys- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 101) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 2.50 
                 1.59 
                 0.573 
                 15.7 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Arg-Lys- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 102) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 3.00 
                 1.70 
                 0.442 
                 15.5 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Lys-Arg- 
               
               
                 Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 104) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala-Cys)- 
                 4.29 
                 2.15 
                 0.425 
                 15.5 
               
               
                 Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Lys-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 103) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.410 
                 0.837 
                 0.246 
                 56.3 
               
               
                 Cys)-β-Ala-Tyr-Gly-Arg-Arg-Lys-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 141) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.572 
                 1.07 
                 0.210 
                 63.6 
               
               
                 Cys)-β-Ala-Tyr-Gly-Arg-Lys-Arg-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 142) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.475 
                 0.800 
                 0.196 
                 53.8 
               
               
                 Cys)-β-Ala-Gly-Arg-Arg-Lys-Arg-Arg-Gln- 
               
               
                 Arg-Arg-Arg-NH 2  (SEQ ID NO: 141) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.779 
                 1.21 
                 0.293 
                 56.0 
               
               
                 Cys)-β-Ala-Gly-Arg-Lys-Arg-Arg-Arg-Gln- 
               
               
                 Arg-Arg-Arg-NH 2  (SEQ ID NO: 142) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.212 
                 1.23 
                 0.484 
                 58.5 
               
               
                 Cys)-β-Ala-Arg-Arg-Lys-Arg-Arg-Gln-Arg- 
               
               
                 Arg-Arg-NH 2  (SEQ ID NO: 143) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.778 
                 1.22 
                 0.468 
                 47.0 
               
               
                 Cys)-β-Ala-Arg-Lys-Arg-Arg-Arg-Gln-Arg- 
               
               
                 Arg-Arg-NH 2  (SEQ ID NO: 144) 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
             
               
             
               
               
               
               
               
             
               
             
               
               
               
               
               
             
           
               
                 TABLE 7 
               
               
                   
               
             
             
               
                 Binding Constants for Formula (V) Examples 
               
               
                 Table 7A 
               
             
          
           
               
                   
                 Ki 
                 Ki 
                 Ki 
                 Ki 
               
               
                 Formula (V) Compounds 
                 hMC1 
                 hMC3 
                 hMC4 
                 hMC5 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Cys-D-Ala))-His-D-Phe- 
                 230 
                 7590 
                 126 
                 7020 
               
               
                 Arg-Trp-Cys]-NH 2  (SEQ ID NO: 271) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe- 
                 72.6 
                 1920 
                 45.2 
                 &gt;10000 
               
               
                 Arg-Trp-Lys]-NH 2  (SEQ ID NO: 276) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe- 
                 60.4 
                 2840 
                 52.4 
                 &gt;10000 
               
               
                 Arg-Trp-Orn]-NH 2  (SEQ ID NO: 276) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe- 
                 28 
                 90.5 
                 12.7 
                 877 
               
               
                 Arg-Trp-Dab]-NH 2  (SEQ ID NO: 276) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe- 
                 16.4 
                 863 
                 4.97 
                 &gt;10000 
               
               
                 Arg-Trp-Dap]-NH 2  (SEQ ID NO: 276) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Asp-D-Ala))-His-D-Phe- 
                 37.7 
                 576 
                 7.81 
                 6400 
               
               
                 Arg-Trp-Orn]-NH 2  (SEQ ID NO: 273) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Asp-D-Ala))-His-D-Phe- 
                 66.6 
                 1820 
                 19.9 
                 &gt;10000 
               
               
                 Arg-Trp-Dap]-NH 2  (SEQ ID NO: 273) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Asp-His))-D-2-Nal-Arg- 
                 200 
                 68.8 
                 6.63 
                 142 
               
               
                 Trp-Lys]-NH 2  (SEQ ID NO: 275) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Asp-Aic))-D-2-Nal-Arg- 
                 9028 
                 2628 
                 35.8 
                 1156 
               
               
                 Trp-Lys]-NH 2  (SEQ ID NO: 275) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Asp-A5c))-D-2-Nal-Arg- 
                 9938 
                 2390 
                 44.6 
                 1103 
               
               
                 Trp-Lys]-NH 2  (SEQ ID NO: 275) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Asp-A6c))-D-2-Nal-Arg- 
                 2170 
                 1479 
                 16.5 
                 451 
               
               
                 Trp-Lys]-NH 2  (SEQ ID NO: 275) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Asp-Apc))-D-2-Nal-Arg- 
                 1276 
                 2756 
                 266 
                 1096 
               
               
                 Trp-Lys]-NH 2  (SEQ ID NO: 275) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Asp-A3c))-D-2-Nal-Arg- 
                 7567 
                 1922 
                 420 
                 2879 
               
               
                 Trp-Lys]-NH 2  (SEQ ID NO: 275) 
               
               
                   
               
             
          
           
               
                 TABLE 7B - 
               
               
                 Binding Constants for Formula (VI) Examples 
               
             
          
           
               
                   
                 Ki 
                 Ki 
                 Ki 
                 Ki 
               
               
                 Formula (VI) Compounds 
                 hMC1 
                 hMC3 
                 hMC4 
                 hMC5 
               
               
                   
               
               
                 Hydantoin(C(O)-(Nle-Gly))-c(Cys-Glu-His-D- 
                 14.3 
                 198 
                 5.76 
                 67.8 
               
               
                 Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 278) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-Gly))-c(Cys-Glu-His-D- 
                 11.9 
                 311 
                 5.41 
                 73.9 
               
               
                 Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 278) 
               
               
                   
               
               
                 Hydantoin(C(O)-(A6c-Nle))-c(Cys-D-Ala-His- 
                 31.6 
                 224 
                 19.6 
                 2500 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 284) 
               
               
                   
               
               
                 Hydantoin(C(O)-(D-Ala-Nle))-c(Cys-D-Ala- 
                 16.0 
                 63.9 
                 8.64 
                 1820 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 284) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Val-Nle))-c(Cys-D-Ala-His- 
                 33.7 
                 132 
                 40.2 
                 3210 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 284) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Leu-Nle))-c(Cys-D-Ala-His- 
                 48.3 
                 534 
                 74.1 
                 3290 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 284) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Cha-Nle))-c(Cys-D-Ala-His- 
                 40.8 
                 870 
                 137 
                 3560 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 284) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Aib-Nle))-c(Cys-D-Ala-His- 
                 17.7 
                 73.6 
                 8.40 
                 2120 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 284) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Nle-Gly))-c(Cys-D-Ala-His- 
                 7.92 
                 46.4 
                 6.70 
                 21.3 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-Gly))-c(Cys-D-Ala-His- 
                 20.9 
                 69.7 
                 8.32 
                 50.0 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Nle-Gly))-c(Cys-D-Ala-His- 
                 12.9 
                 38.5 
                 3.53 
                 27.1 
               
               
                 D-Phe-Arg-Trp-Pen)-NH 2  (SEQ ID NO: 280) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-Gly))-c(Cys-D-Ala-His- 
                 127 
                 811 
                 10.4 
                 381 
               
               
                 D-Phe-Arg-Trp-Pen)-NH 2  (SEQ ID NO: 280) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Ala-Gly))-c(Cys-D-Ala-His- 
                 13.9 
                 38.4 
                 5.73 
                 18.9 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(D-Ala-Gly))-c(Cys-D-Ala- 
                 11.7 
                 73.1 
                 4.28 
                 34.7 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Aib-Gly))-c(Cys-D-Ala-His- 
                 36.8 
                 290 
                 13.7 
                 133 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Val-Gly))-c(Cys-D-Ala-His- 
                 15.3 
                 160 
                 8.66 
                 33.4 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Ile-Gly))-c(Cys-D-Ala-His- 
                 11.6 
                 194 
                 11.5 
                 28.9 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Leu-Gly))-c(Cys-D-Ala-His- 
                 19.3 
                 331 
                 26.7 
                 44.6 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-Glu-His- 
                 9.49 
                 124 
                 2.95 
                 2260 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 278) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-D-Arg))-c(Cys-Glu-His- 
                 4.30 
                 78.0 
                 1.77 
                 4540 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 287) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Arg-Gly))-c(Cys-Glu-His-D- 
                 8.59 
                 94.1 
                 2.44 
                 7760 
               
               
                 Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 278) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-Arg))-c(Cys-Glu-His-D- 
                 5.68 
                 55.5 
                 2.44 
                 4220 
               
               
                 Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 285) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Arg-Gly))-c(Cys-D-Ala-His- 
                 2.65 
                 41.3 
                 4.17 
                 650 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-D-Ala- 
                 3.52 
                 48.7 
                 5.78 
                 872 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-D-Arg))-c(Cys-D-Ala- 
                 3.51 
                 29.2 
                 6.04 
                 914 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO288) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-Arg))-c(Cys-D-Ala-His- 
                 1.14 
                 01.7 
                 4.53 
                 783 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 286) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Arg-Gly))-c(Cys-D-Ala-His- 
                 11.9 
                 7.43 
                 0.195 
                 14.6 
               
               
                 D-2-Nal-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 282) 
               
               
                   
               
             
          
           
               
                 TABLE 7C - 
               
               
                 Binding Constants for Formula (VII) Examples 
               
             
          
           
               
                   
                 Ki 
                 Ki 
                 Ki 
                 Ki 
               
               
                 Formula (VII) Compounds 
                 hMC1 
                 hMC3 
                 hMC4 
                 hMC5 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Aib-Cys))-D-Ala-His-D- 
                 47.6 
                 1100 
                 47.1 
                 &gt;10000 
               
               
                 Phe-Arg-Trp-Cys]-NH 2  (SEQ ID NO: 290) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Val-Cys))-D-Ala-His-D- 
                 21.2 
                 730 
                 34.5 
                 &gt;10000 
               
               
                 Phe-Arg-Trp-Cys]-NH 2  (SEQ ID NO: 290) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Leu-Cys))-D-Ala-His-D- 
                 47.4 
                 1550 
                 27.9 
                 &gt;10000 
               
               
                 Phe-Arg-Trp-Cys]-NH 2  (SEQ ID NO: 290) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Ile-Cys))-D-Ala-His-D-Phe- 
                 53.4 
                 1760 
                 41.6 
                 &gt;10000 
               
               
                 Arg-Trp-Cys]-NH 2  (SEQ ID NO: 290) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(A6c-Cys))-D-Ala-His-D- 
                 38.5 
                 1760 
                 53.2 
                 9270 
               
               
                 Phe-Arg-Trp-Cys]-NH 2  (SEQ ID NO: 290) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Gly-Cys))-Glu-His-D-Phe- 
                 15.6 
                 305 
                 8.92 
                 3070 
               
               
                 Arg-Trp-Cys]-NH 2  (SEQ ID NO: 291) 
               
               
                   
               
             
          
         
       
     
                                                                 TABLE 8                   Radioligand Binding Assay Data for Selected Compounds                Ki   Ki   Ki   Ki       Compound   hMC1-R   hMC3-R   hMC4-R   hMC5-R                    Ac-Tyr-Arg-c(Cys-D-Ala-His-D-Phe-   8.53   21.2   3.72   714       Arg-Trp-Cys)-NH 2  (SEQ ID NO: 292)               Ac-2-Nal-Arg-c(Cys-D-Ala-His-D-Phe-   6.09   34.9   2.02   864       Arg-Trp-Cys)-NH 2  (SEQ ID NO: 292)               Ac-1-Nal-Arg-c(Cys-D-Ala-His-D-Phe-   6.27   36.4   1.53   888       Arg-Trp-Cys)-NH 2  (SEQ ID NO: 292)               Ac-Phe-Arg-c(Cys-D-Ala-His-D-Phe-   1.48   14.8   2.34   491       Arg-Trp-Cys)-NH 2  (SEQ ID NO: 292)               Ac-Trp-Arg-c(Cys-D-Ala-His-D-Phe-   4.7   42   2.25   1470       Arg-Trp-Cys)-NH 2  (SEQ ID NO: 292)               Ac-Pff-Arg-c(Cys-D-Ala-His-D-Phe-   0.323   1.33   1.95   786       Arg-Trp-Cys)-NH 2  (SEQ ID NO: 292)                    
Melanocortin Functional Activity and Selectivity
 
     The compounds of the present invention will interact preferentially (i.e., selectively) to MC-4 relative to the other melanocortin receptors. Selectivity is particularly important when the compounds are administered to humans or other animals to minimize the number of side effects associated with their administration. MC-4 selectivity of a compound is defined herein as the ratio of the EC 50  of the compound for an MC-1 receptor (EC 50 -MC-1) over the EC 50  of the compound for the MC-3 (EC 50 -MC-3)/MC-4 (EC 50 -MC-4) receptor, the EC 50  values being measured as described above. The formulas are as follows:
 
MC-3 selectivity=[EC 50 -MC-1]/[EC 50 -MC-3]
 
MC-4 selectivity=[EC 50 -MC-1]/[EC 50 -MC-4]
 
A compound is defined herein as being “selective for the MC-3 receptor” when the above mentioned ratio “MC-3-selectivity” is at least about 10, preferably at least about 100, and more preferably at least about 500.
 
     A compound is defined herein as being “selective for the MC-4 receptor” when the above mentioned ratio “MC-4-selectivity” is at least about 10, preferably at least about 100, and more preferably at least about 500. 
     One skilled in the art would know that procedures similar to those described herein may be used to assay the binding activities of the compounds of the invention to melanocortin receptor molecules. 
     Cyclic AMP Bioassay 
     Intracellular cyclic AMP (cAMP) levels were determined by an electrochemiluminescence (ECL) assay (Meso Scale Discovery®, Gaithersburg, Md.; referred to hereinafter as MSD). CHO-K1 cells stably expressing the hMC receptor subtypes were suspended in RMPI 1640 ® assay buffer (RMPI 1640 buffer contains 0.5 mM isobutylmethylxanthine (IBMX), and 0.2% protein cocktail (MSD blocker A)). Transgenic CHO-K1 cells stably expressing hMC receptor subtypes 1, 3, 4 or 5 were dispensed at a density of approximately 7,000 cells/well in 384-well Multi-Array® plates (MSD) containing integrated carbon electrodes and coated with anti-cAMP antibody. Increasing concentrations of the test compounds were added and the cells were incubated for approximately 40 minutes at approximately 37° C. Following this incubation, lysis buffer (HEPES-buffered saline solution with MgCl 2  and Triton X-100® at ph 7.3) containing 0.2% protein cocktail and 2.5 nM TAG™ ruthenium-labeled cAMP (MSD) was added and the cells were incubated for approximately 90 minutes at room temperature. At the end of the second incubation period read buffer (Tris-buffered solution containing an ECL co-reactant and Triton X-100 at ph 7.8) was added and the cAMP levels in the cell lysates were immediately determined by ECL detection with a Sector Imager 6000 Reader® (MSD). Data were analyzed using a computer-assisted non-linear regression analysis (XL fit; IDBS) and reported as either an EC 50  value or a Kb value. 
     EC 50  represents the concentration of an agonist compound needed to obtain 50% of the maximum reaction response, e.g., 50% of the maximum level of cAMP as determined using the assay described above. The Kb value reflects the potency of an antagonist and is determined by Schild analysis. In brief, concentration-response curves of an agonist are carried out in the presence of increasing concentrations of an antagonist. The Kb value is the concentration of antagonist which would produce a 2-fold shift in the concentration-response curve for an agonist. It is calculated by extrapolating the line on a Schild plot to zero on the y-axis. 
     A selection of compounds was tested using the above-discussed assays and the results are reported in Tables 9, 10, 11, and 12. 
     
       
         
               
             
               
               
               
               
               
               
               
             
               
             
               
               
               
               
               
               
               
             
               
             
               
               
               
               
               
               
             
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 9 
               
               
                   
               
               
                 cAMP Bioassay Data for Selected Compounds 
               
               
                   
               
             
             
               
                 Table 9A 
               
             
          
           
               
                   
                   
                   
                   
                   
                 EC 50   
                   
               
               
                   
                 EC 50   
                 EC 50   
                 EC 50   
                 EC 50   
                 hMC1-R/ 
                 SEQ ID 
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 hMC4-R 
                 hMC5-R 
                 MC4-R 
                 NO: 
               
               
                   
               
               
                 Ac-Arg-c(Cys-D- 
                 5.79 
                 5.25 
                 0.313 
                 1630 
                 18.0 
                 SEQ ID 
               
               
                 Ala-His-D-Phe- 
                   
                   
                   
                   
                   
                 NO: 50 
               
               
                 Arg-Trp-Cys)-NH 2   
               
               
                   
               
               
                 Ac-D-Arg-c(Cys-D- 
                 6.17 
                 5.6 
                 0.397 
                 1020 
                 16.0 
                 SEQ ID 
               
               
                 Ala-His-D-Phe- 
                   
                   
                   
                   
                   
                 NO: 50 
               
               
                 Arg-Trp-Cys)-NH 2   
               
               
                   
               
               
                 Ac-D-Arg-c(Cys-D- 
                 26.5 
                 10.5 
                 0.493 
                 2440 
                 54.0 
                 SEQ ID 
               
               
                 Ala-His-D-Phe- 
                   
                   
                   
                   
                   
                 NO: 51 
               
               
                 Arg-Trp-Pen)-NH 2   
               
               
                   
               
               
                 Ac-D-Arg-c(Cys- 
                 8.43 
                 32.4 
                 0.959 
                 2140 
                 9.0 
                 SEQ ID 
               
               
                 His-D-Phe-Arg- 
                   
                   
                   
                   
                   
                 NO: 52 
               
               
                 Trp-Gaba-Pen)-NH 2   
               
               
                   
               
               
                 Ac-Arg-c(Cys-His- 
                 4.23 
                 8.09 
                 0.719 
                 23.2 
                 6.0 
                 SEQ ID 
               
               
                 D-Phe-Arg-Trp- 
                   
                   
                   
                   
                   
                 NO: 52 
               
               
                 Gaba-Pen)-NH 2   
               
               
                   
               
               
                 Ac-Arg-c(Cys-D- 
                 48.3 
                 13.3 
                 0.79 
                 10000 
                 61.0 
                 SEQ ID 
               
               
                 Ala-His-D-Phe- 
                   
                   
                   
                   
                   
                 NO: 51 
               
               
                 Arg-Trp-Pen)-NH 2   
               
               
                   
               
               
                 Ac-D-Arg-c(Asp- 
                 1.48 
                 5.76 
                 0.078 
                 297 
                 19.0 
                 SEQ ID 
               
               
                 His-D-Phe-Arg- 
                   
                   
                   
                   
                   
                 NO: 53 
               
               
                 Trp-Ala-Lys)-NH 2   
               
               
                   
               
               
                 Ac-Arg-c(Asp-His- 
                 1.39 
                 2.89 
                 0.055 
                 467 
                 25.0 
                 SEQ ID 
               
               
                 D-Phe-Arg-Trp- 
                   
                   
                   
                   
                   
                 NO: 53 
               
               
                 Ala-Lys)-NH 2   
               
               
                   
               
             
          
           
               
                 Table 9B 
               
             
          
           
               
                   
                   
                   
                   
                   
                 EC 50   
                   
               
               
                   
                 EC 50   
                 EC 50   
                 EC 50   
                 EC 50   
                 hMC1-R/ 
                 SEQ ID 
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 hMC4-R 
                 hMC5-R 
                 MC4-R 
                 NO: 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His- 
                 2.4 
                 0.33 
                 0.078 
                 420 
                 31 
                 SEQ ID 
               
               
                 D-Phe-Arg-Trp-Cys)- 
                   
                   
                   
                   
                   
                 NO: 7 
               
               
                 NH 2   
               
               
                   
               
               
                 D-Phe-c(Cys-His-D- 
                 0.35 
                 1.1 
                 0.11 
                 0.37 
                 3 
                 SEQ ID 
               
               
                 (Et)Tyr-Arg-Trp-β-Ala- 
                   
                   
                   
                   
                   
                 NO: 24 
               
               
                 D-Cys)-Thr-NH 2   
               
               
                   
               
               
                 Nle-c(Cys-His-D-Phe- 
                 0.31 
                 0.27 
                 0.018 
                 3.1 
                 17 
                 SEQ ID 
               
               
                 Arg-Trp-Apn-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 27 
               
               
                   
               
               
                 Ac-Nle-c(Cys-His-D-Phe- 
                 0.28 
                 0.24 
                 0.028 
                 3.9 
                 10 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Pen)-NH 2   
                   
                   
                   
                   
                   
                 NO: 32 
               
               
                   
               
               
                 Nle-c(Cys-His-D-Phe- 
                 0.37 
                 0.1 
                 0.021 
                 1.7 
                 18 
                 SEQ ID 
               
               
                 Arg-Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 34 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D- 
                 0.834 
                 0.145 
                 0.128 
                 2.79 
                 6.52 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-β-Ala-Lys)- 
                   
                   
                   
                   
                   
                 NO: 1 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Cys-His-D-Phe- 
                 0.76 
                 0.199 
                 0.0492 
                 1.73 
                 15.45 
                 SEQ ID 
               
               
                 Arg-Trp-Apn-Cys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 2 
               
               
                   
               
               
                 Ac-Cha-c(Asp-His-D- 
                 3.26 
                 0.189 
                 0.0949 
                 30.2 
                 34.35 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Gaba-Lys)- 
                   
                   
                   
                   
                   
                 NO: 6 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D- 
                 1.37 
                 0.628 
                 0.131 
                 3.48 
                 10.46 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Gaba-Lys)- 
                   
                   
                   
                   
                   
                 NO: 6 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-hCha-c(Asp-His-D- 
                 2.27 
                 3.32 
                 7.24 
                 415 
                 0.31 
                 SEQ ID 
               
               
                 Phe-Arg-Trp-Gaba-Lys)- 
                   
                   
                   
                   
                   
                 NO: 11 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Pen-D-Ala-His- 
                 ND 
                 1.89 
                 0.531 
                 ND 
                 ND 
                 SEQ ID 
               
               
                 D-Phe-Arg-Trp-Cys)- 
                   
                   
                   
                   
                   
                 NO: 21 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His- 
                 14.3 
                 2.03 
                 0.183 
                 2240 
                 78.14 
                 SEQ ID 
               
               
                 D-Phe-Arg-Trp-Pen)- 
                   
                   
                   
                   
                   
                 NO: 22 
               
               
                 NH 2   
               
               
                   
               
               
                 D-Phe-c(Cys-His-D- 
                 0.345 
                 2.71 
                 5376 
                 2.38 
                 0.06 
                 SEQ ID 
               
               
                 (Et)Tyr-hArg-Trp-β-Ala- 
                   
                   
                   
                   
                   
                 NO: 24 
               
               
                 D-Cys)-Thr-NH 2   
               
               
                   
               
               
                 D-Phe-c(Cys-His-D- 
                 0.685 
                 81.8 
                 86.9 
                 31.8 
                 0.01 
                 SEQ ID 
               
               
                 (Et)Tyr-hArg-Bip-β-Ala- 
                   
                   
                   
                   
                   
                 NO: 26 
               
               
                 D-Cys)-Thr-NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Asp-D-Ala-His- 
                 0.931 
                 3.22 
                 1.65 
                 &gt;10000 
                 0.56 
                 SEQ ID 
               
               
                 D-Phe-Arg-Bal-Lys)-NH 2   
                   
                   
                   
                   
                   
                 NO: 28 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Leu-His- 
                 3.24 
                 0.465 
                 0.0915 
                 78.5 
                 35.41 
                 SEQ ID 
               
               
                 D-Phe-Arg-Trp-Cys)- 
                   
                   
                   
                   
                   
                 NO: 30 
               
               
                 NH 2   
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Cha- 
                 0.819 
                 0.541 
                 0.453 
                 45.3 
                 1.81 
                 SEQ ID 
               
               
                 His-D-Phe-Arg-Trp-Cys)- 
                   
                   
                   
                   
                   
                 NO: 30 
               
               
                 NH 2   
               
               
                   
               
             
          
           
               
                 Table 9C 
               
             
          
           
               
                   
                 EC50 
                 Kb 
                 Kb 
                 EC50 
                 SEQ ID 
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 MC4-R 
                 hMC5-R 
                 NO: 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-2- 
                 17.6 
                 12.4 
                 38.8 
                 11.8 
                 SEQ ID 
               
               
                 Nal-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                 NO: 16 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg- 
                 0.619 
                 2.98 
                 0.109 
                 0.189 
                 SEQ ID 
               
               
                 Trp-Ala-Lys)-NH 2   
                   
                   
                   
                   
                 NO: 38 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg- 
                 0.913 
                 0.536 
                 0.346 
                 0.489 
                 SEQ ID 
               
               
                 Trp-β-Ala-Lys)-NH 2   
                   
                   
                   
                   
                 NO: 38 
               
               
                   
               
               
                 Ac-Nle-c(Cys-His-D-2-Nal-Arg- 
                 0.231 
                 18.4 
                 0.782 
                 0.153 
                 SEQ ID 
               
               
                 Trp-Gaba-Cys)-NH 2   
                   
                   
                   
                   
                 NO: 39 
               
               
                   
               
               
                 Ac-Nle-c(Cys-His-D-2-Nal-Arg- 
                 0.581 
                 10.8 
                 0.967 
                 0.126 
                 SEQ ID 
               
               
                 Trp-Ahx-Cys)-NH 2   
                   
                   
                   
                   
                 NO: 39 
               
               
                   
               
               
                 Ac-hPhe-c(Asp-His-D-2-Nal-Arg- 
                 0.413 
                 9.32 
                 0.824 
                 0.307 
                 SEQ ID 
               
               
                 Trp-Gaba-Lys)-NH 2   
                   
                   
                   
                   
                 NO: 40 
               
               
                   
               
               
                 Ac-Cha-c(Asp-His-D-2-Nal-Arg- 
                 1.27 
                 3.02 
                 0.442 
                 0.736 
                 SEQ ID 
               
               
                 Trp-Gaba-Lys)-NH 2   
                   
                   
                   
                   
                 NO: 40 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-2- 
                 383 
                 61.5 
                 53.6 
                 2842 
                 SEQ ID 
               
               
                 Nal-Arg-1-Nal-Cys)-NH 2   
                   
                   
                   
                   
                 NO: 16 
               
               
                   
               
             
          
           
               
                 Table 9D 
               
             
          
           
               
                   
                 EC50 
                 Kb 
                 Kb 
                 EC50 
                 SEQ ID 
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 MC4-R 
                 hMC5-R 
                 NO: 
               
               
                   
               
               
                 Ac-Arg-c(Cys-D-Ala-His-D-2- 
                 193 
                 5.72 
                 1.58 
                 1111 
                 SEQ ID 
               
               
                 Nal-Arg-Trp-Cys)-NH 2   
                   
                   
                   
                   
                 NO: 49 
               
               
                   
               
               
                 ND = not determined 
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
             
               
             
               
               
               
               
               
             
               
             
               
               
               
               
               
             
               
             
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Table 10A 
               
             
          
           
               
                   
                 EC 50   
                 Kb 
                 Kb 
                 EC 50   
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 hMC4-R 
                 hMC5-R 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 66.1 
                 33.4 
                 0.687 
                 6.84 
               
               
                 Cys)-Pro-Pro-Lys-Asp-NH 2  (SEQ ID 
               
               
                 NO: 269) 
               
               
                   
               
               
                 Tyr-Gly-Arg-Lys-Lys-Arg-Arg-Gln-Arg- 
                 ND 
                 4500 
                 105 
                 ND 
               
               
                 Arg-Arg-Nle-c(Asp-His-D-2-Nal-Arg-Trp- 
               
               
                 Lys)-NH 2  (SEQ ID NO: 60) 
               
               
                   
               
               
                 Tyr-Gly-Arg-Lys-Lys-Arg-Arg-Gln-Arg- 
                 ND 
                 395 
                 16.8 
                 ND 
               
               
                 Arg-Arg-Doc-Nle-c(Asp-His-D-2-Nal-Arg- 
               
               
                 Trp-Lys)-NH 2  (SEQ ID NO: 61) 
               
               
                   
               
               
                 Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-β- 
                 ND 
                 207 
                 18.5 
                 ND 
               
               
                 Ala-Tyr-Gly-Arg-Lys-Lys-Arg-Arg-Gln- 
               
               
                 Arg-Arg-Arg-NH 2  (SEQ ID NO: 62) 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-β- 
                 ND 
                 220 
                 4.07 
                 ND 
               
               
                 Ala-Tyr-Gly-Arg-Lys-Lys-Arg-Arg-Gln- 
               
               
                 Arg-Arg-Arg-NH 2  (SEQ ID NO: 62) 
               
               
                   
               
               
                 H-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)- 
                 ND 
                 261 
                 3.11 
                 ND 
               
               
                 Doc-Doc-Tyr-Gly-Arg-Lys-Lys-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 63) 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)- 
                 ND 
                 14.1 
                 22.8 
                 ND 
               
               
                 Pro-Pro-Lys-Asp-Tyr-Gly-Arg-Lys-Lys- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 64) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Gly- 
                 ND 
                 233 
                 26.0 
                 ND 
               
               
                 Cys)-Pro-Pro-Lys-Asp-Tyr-Gly-Arg-Lys- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 65) 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)-β- 
                 1.39 
                 16.2 
                 7.94 
                 0.839 
               
               
                 Ala-β-Ala-Tyr-Gly-Arg-Lys-Lys-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 66) 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)- 
                 3.65 
                 19.4 
                 3.73 
                 1.61 
               
               
                 Pro-Pro-Lys-Asp-Doc-Tyr-Gly-Arg-Lys- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 67) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Gly- 
                 ND 
                 17.7 
                 1.49 
                 ND 
               
               
                 Cys)-Pro-Pro-Lys-Asp-Doc-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 68) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 6.3 
                 70.0 
                 1.66 
                 38.2 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Gln-Arg-Arg-Arg- 
               
               
                 NH 2  (SEQ ID NO: 69) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 12.1 
                 30.3 
                 1.81 
                 70.0 
               
               
                 Cys)-Pro-Pro-Lys-Asp-Doc-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 69) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 33.6 
                 140 
                 12.2 
                 66.9 
               
               
                 Cys)-Pro-Pro-Lys-Asp-NH 2  (SEQ ID 
               
               
                 NO: 269) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 269 
                 105 
                 5.92 
                 104 
               
               
                 Cys)-Pro-Pro-Lys-Asp-NH 2  (SEQ ID 
               
               
                 NO: 269) 
               
               
                   
               
               
                 Ac-c Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 690 
                 70.7 
                 4.56 
                 177 
               
               
                 Cys)-Pro-Pro-Lys-Asp-NH 2  (SEQ ID 
               
               
                 NO: 269) 
               
               
                   
               
               
                 Ac-Nle-c(Asp-His-D-2-Nal-Arg-Trp-Lys)- 
                 3.23 
                 8.97 
                 4.61 
                 2.86 
               
               
                 Doc-Doc-Tyr-Gly-Arg-Lys-Lys-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 70) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 52.0 
                 170 
                 6.14 
                 328 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 72) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 146 
                 104 
                 32.0 
                 1400 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Arg- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 73) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 114 
                 44.6 
                 28.4 
                 879 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Arg-Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 74) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 67.1 
                 439 
                 46.5 
                 582 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Aib-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 79) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 144 
                 116 
                 8.93 
                 819 
               
               
                 Cys)-Pro-Pro-Arg-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 80) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 36.0 
                 46.5 
                 11.4 
                 56.1 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 80) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 93.0 
                 71 
                 15.9 
                 &gt;10000 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 81) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 39.7 
                 30.9 
                 6.66 
                 501 
               
               
                 Cys)-Pro-Pro-Arg-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 82) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 35.2 
                 22.9 
                 12.6 
                 199 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 82) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 29.1 
                 13.6 
                 13.4 
                 204 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 81) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 86.1 
                 41.7 
                 19.4 
                 2360 
               
               
                 Cys)-Pro-Pro-Arg-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 83) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 38.3 
                 20.2 
                 21.2 
                 &gt;10000 
               
               
                 Cys)-Pro-Pro-Arg-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 84) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 68.6 
                 153 
                 33.2 
                 &gt;10000 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Arg- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 83) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 70.4 
                 286 
                 18.6 
                 &gt;10000 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Lys- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 88) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 33.1 
                 65.1 
                 15.3 
                 1720 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Lys-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 89) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 88.2 
                 10.6 
                 17.4 
                 514 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Lys- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 88) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 58.7 
                 39.3 
                 10.3 
                 460 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Arg-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 90) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 45.4 
                 12.7 
                 12.7 
                 162 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Arg- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 91) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 309 
                 22.8 
                 17.1 
                 570 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Lys- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 92) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 7.86 
                 10.5 
                 0.843 
                 4900 
               
               
                 Cys)-β-Ala-Tyr-Gly-Arg-Arg-Arg-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 139) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 29.7 
                 25.6 
                 7.37 
                 82.9 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 71) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 15.2 
                 14.6 
                 4.52 
                 36.8 
               
               
                 Cys)-Pro-Pro-Lys-Asp-βAla-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Gln-Arg-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 75) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 6.7 
                 9.38 
                 11.7 
                 46.2 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Gln-Arg-Arg-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 76) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 7.9 
                 41.7 
                 10.9 
                 62.4 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Gln-Lys-Arg-Arg-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 77) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 16.9 
                 36.0 
                 7.12 
                 58.9 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Arg-Arg-Gln-Arg-NH 2   
               
               
                 (SEQ ID NO: 78) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 16.4 
                 20.8 
                 7.31 
                 44.2 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Arg-Gln-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 85) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 12.0 
                 13.7 
                 9.38 
                 54.2 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Gln-Lys-Lys-Arg-Arg-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 86) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Trp-Ala- 
                 7.5 
                 12.2 
                 7.61 
                 51.7 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Arg-Arg-Arg-Gln- 
               
               
                 NH 2  (SEQ ID NO: 87) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 43.3 
                 215 
                 5.87 
                 1286 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 71) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 37.9 
                 112 
                 41.1 
                 1798 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 71) 
               
               
                   
               
             
          
           
               
                 Table 10B 
               
             
          
           
               
                   
                 EC50 
                 EC50 
                 EC50 
                 EC50 
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 hMC4-R 
                 hMC5-R 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 4.70 
                 4.56 
                 0.634 
                 147 
               
               
                 Cys)-(Doc)2-Tyr-Gly-Arg-Lys-Lys-Arg- 
               
               
                 Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 136) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 5.90 
                 7.73 
                 1.02 
                 2890 
               
               
                 Cys)-β-Ala-Tyr-Gly-Arg-Lys-Lys-Arg-Gln- 
               
               
                 Arg-Arg-Arg-Arg-NH 2  (SEQ ID NO: 137) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 0.481 
                 7.32 
                 0.964 
                 2010 
               
               
                 Cys)-β-Ala-Gly-Arg-Arg-Arg-Arg-Arg-Gln- 
               
               
                 Arg-Arg-Arg-NH 2  (SEQ ID NO: 136) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 7.15 
                 9.37 
                 1.25 
                 1570 
               
               
                 Cys)-β-Ala-Arg-Arg-Arg-Arg-Arg-Gln-Arg- 
               
               
                 Arg-Arg-NH 2  (SEQ ID NO: 138) 
               
               
                   
               
             
          
           
               
                 Table 10C 
               
             
          
           
               
                   
                 EC 50   
                 Kb 
                 Kb 
                 EC 50   
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 hMC4-R 
                 hMC5-R 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-β- 
                 ND 
                 ND 
                 ND 
                 ND 
               
               
                 Ala-Cys)-Pro-Pro-Lys-Asp-NH 2  (SEQ ID 
               
               
                 NO: 270) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Aib- 
                 770 
                 221 
                 4.52 
                 869 
               
               
                 Cys)-Pro-Pro-Lys-Asp-NH 2  (SEQ ID 
               
               
                 NO: 270) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 29 
                 22.6 
                 16.7 
                 173 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Arg-Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 95) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 102 
                 26.3 
                 14.6 
                 261 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 96) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 26.6 
                 101 
                 9.34 
                 351 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Arg- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 97) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-1-Nal-Ala- 
                 45.5 
                 181 
                 6.35 
                 149 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Lys- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 92) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 23.7 
                 9.22 
                 5.87 
                 39.7 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Lys-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 99) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-2-Nal-Ala- 
                 34.7 
                 15.0 
                 8.68 
                 28.2 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 101) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 19.1 
                 106 
                 4.59 
                 100 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Lys-Arg- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 105) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 19.8 
                 37.8 
                 8.43 
                 158 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Arg-Lys-Arg-Arg-Gln-Arg-Arg-Arg- 
               
               
                 NH 2  (SEQ ID NO: 100) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 11.2 
                 52.1 
                 9.45 
                 95.7 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Tyr-Gly-Arg- 
               
               
                 Lys-Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2   
               
               
                 (SEQ ID NO: 101) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 33.8 
                 93.6 
                 4.42 
                 89.5 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Arg- 
               
               
                 Lys-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 102) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 232 
                 68.8 
                 10.0 
                 250 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Arg-Arg-Lys- 
               
               
                 Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ ID 
               
               
                 NO: 104) 
               
               
                   
               
               
                 Ac-c(Cys-Glu-His-D-2-Nal-Arg-Bal-Ala- 
                 32.2 
                 98.3 
                 5.23 
                 194 
               
               
                 Cys)-Pro-Pro-Lys-Asp-β-Ala-Gly-Arg-Lys- 
               
               
                 Arg-Arg-Arg-Gln-Arg-Arg-Arg-NH 2  (SEQ 
               
               
                 ID NO: 103) 
               
               
                   
               
             
          
           
               
                 Table 10D 
               
             
          
           
               
                   
                 EC50 
                 EC50 
                 EC50 
                 EC50 
               
               
                 Compound 
                 hMC1-R 
                 hMC3-R 
                 hMC4-R 
                 hMC5-R 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 5.66 
                 4.70 
                 0.422 
                 1551 
               
               
                 Cys)-β-Ala-Tyr-Gly-Arg-Arg-Lys-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 141) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 7.57 
                 4.18 
                 0.600 
                 1792 
               
               
                 Cys)-β-Ala-Tyr-Gly-Arg-Lys-Arg-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 142) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 2.36 
                 2.74 
                 0.260 
                 500 
               
               
                 Cys)-β-Ala-Gly-Arg-Arg-Lys-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 141) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 2.81 
                 3.29 
                 0.298 
                 566 
               
               
                 Cys)-β-Ala-Gly-Arg-Lys-Arg-Arg-Arg- 
               
               
                 Gln-Arg-Arg-Arg-NH 2  (SEQ ID NO: 142) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 1.86 
                 1.39 
                 0.367 
                 165 
               
               
                 Cys)-β-Ala-Arg-Arg-Lys-Arg-Arg-Gln- 
               
               
                 Arg-Arg-Arg-NH 2  (SEQ ID NO: 143) 
               
               
                   
               
               
                 Ac-Nle-c(Cys-D-Ala-His-D-Phe-Arg-Trp- 
                 2.06 
                 1.61 
                 0.394 
                 199 
               
               
                 Cys)-β-Ala-Arg-Lys-Arg-Arg-Arg-Gln- 
               
               
                 Arg-Arg-Arg-NH 2  (SEQ ID NO: 144) 
               
               
                   
               
               
                 ND = not determined 
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
             
               
             
               
               
               
               
               
             
               
             
               
               
               
               
               
             
           
               
                 TABLE 11 
               
               
                   
               
               
                 Intracellular Cyclic AMP (cAMP) Levels for 
               
               
                 Formula (I) Examples 
               
               
                   
               
             
             
               
                 Table 11A 
               
             
          
           
               
                   
                 EC 50   
                 EC 50   
                 EC 50   
                 EC 50   
               
               
                 Formula (V) Compounds 
                 hMC1 
                 hMC3 
                 hMC4 
                 hMC5 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Cys-D-Ala))-His-D-Phe- 
                 — 
                 218 
                 5.42 
                 — 
               
               
                 Arg-Trp-Cys]-NH 2  (SEQ ID NO: 271) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe- 
                 — 
                 22.3 
                 3.62 
                 — 
               
               
                 Arg-Trp-Lys]-NH 2  (SEQ ID NO: 276) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe- 
                 — 
                 39.2 
                 4.94 
                 — 
               
               
                 Arg-Trp-Orn]-NH 2  (SEQ ID NO: 276) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Glu-D-Ala))-His-D-Phe- 
                 56.7 
                 18.2 
                 0.182 
                 &gt;10000 
               
               
                 Arg-Trp-Dap]-NH 2  (SEQ ID NO: 276) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Asp-D-Ala))-His-D- 
                 56.6 
                 88.6 
                 4.50 
                 9300 
               
               
                 Phe-Arg-Trp-Orn]-NH 2  (SEQ ID NO: 273) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Asp-D-Ala))-His-D- 
                 — 
                 49.3 
                 2.12 
                 — 
               
               
                 Phe-Arg-Trp-Dap]-NH 2  (SEQ ID NO: 273) 
               
               
                   
               
             
          
           
               
                 TABLE 11B- 
               
             
          
           
               
                   
                 EC 50   
                 EC 50   
                 EC 50   
                 EC 50   
               
               
                 Formula (VI) Compounds 
                 hMC1 
                 hMC3 
                 hMC4 
                 hMC5 
               
               
                   
               
               
                 Hydantoin(C(O)-(Nle-Gly))-c(Cys-Glu-His- 
                 54.3 
                 12.2 
                 0.177 
                 &gt;10000 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 278) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-Gly))-c(Cys-Glu-His- 
                 124 
                 8.05 
                 0.214 
                 &gt;10000 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 278) 
               
               
                   
               
               
                 Hydantoin(C(O)-(A6c-Nle))-c(Cys-D-Ala- 
                 — 
                 4.89 
                 1.80 
                 — 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 284) 
               
               
                   
               
               
                 Hydantoin(C(O)-(D-Ala-Nle))-c(Cys-D-Ala- 
                 — 
                 2.56 
                 1.47 
                 — 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 284) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Val-Nle))-c(Cys-D-Ala- 
                 — 
                 4.61 
                 0.977 
                 — 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 284) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Leu-Nle))-c(Cys-D-Ala- 
                 — 
                 9.68 
                 1.83 
                 — 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 284) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Cha-Nle))-c(Cys-D-Ala- 
                 — 
                 9.97 
                 13.9 
                 — 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 284) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-Gly))-c(Cys-D-Ala- 
                 14.2 
                 2.46 
                 0.336 
                 201 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Nle-Gly))-c(Cys-D-Ala- 
                 17.0 
                 21.5 
                 0.584 
                 352 
               
               
                 His-D-Phe-Arg-Trp-Pen)-NH 2  (SEQ ID 
               
               
                 NO: 280) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-Gly))-c(Cys-D-Ala- 
                 40.2 
                 8.90 
                 0.495 
                 8300 
               
               
                 His-D-Phe-Arg-Trp-Pen)-NH 2  (SEQ ID 
               
               
                 NO: 280) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Ala-Gly))-c(Cys-D-Ala- 
                 17.6 
                 2.23 
                 0.241 
                 516 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(D-Ala-Gly))-c(Cys-D-Ala- 
                 4.70 
                 2.22 
                 0.309 
                 355 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-Glu- 
                 18.0 
                 17.1 
                 0.160 
                 2710 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 278) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-D-Arg))-c(Cys-Glu- 
                 12.9 
                 10.3 
                 0.125 
                 7440 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 287) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Arg-Gly))-c(Cys-Glu-His- 
                 8.83 
                 7.86 
                 0.0979 
                 4010 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 278) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-Arg))-c(Cys-Glu-His- 
                 9.97 
                 3.63 
                 0.0687 
                 335 
               
               
                 D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 285) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Arg-Gly))-c(Cys-D-Ala- 
                 8.81 
                 18.2 
                 0.503 
                 3560 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(D-Arg-Gly))-c(Cys-D- 
                 11.5 
                 23.2 
                 0.513 
                 3950 
               
               
                 Ala-His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 279) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-D-Arg))-c(Cys-D- 
                 7.53 
                 11.6 
                 0.435 
                 9840 
               
               
                 Ala-His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 288) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Gly-Arg))-c(Cys-D-Ala- 
                 8.85 
                 5.17 
                 0.599 
                 3610 
               
               
                 His-D-Phe-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 286) 
               
               
                   
               
               
                 Hydantoin(C(O)-(Arg-Gly))-c(Cys-D-Ala- 
                 96.6 
                 13.1 
                 21.2 
                 103 
               
               
                 His-D-2-Nal-Arg-Trp-Cys)-NH 2  (SEQ ID 
               
               
                 NO: 282) 
               
               
                   
               
             
          
           
               
                 TABLE 11C 
               
             
          
           
               
                   
                 EC 50   
                 EC 50   
                 EC 50   
                 EC 50   
               
               
                 Formula (VII) Compounds 
                 hMC1 
                 hMC3 
                 hMC4 
                 hMC5 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Aib-Cys))-D-Ala-His-D- 
                 — 
                 6.28 
                 0.407 
                 — 
               
               
                 Phe-Arg-Trp-Cys]-NH 2  (SEQ ID NO: 290) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Val-Cys))-D-Ala-His-D- 
                 — 
                 3.77 
                 0.214 
                 — 
               
               
                 Phe-Arg-Trp-Cys]-NH 2  (SEQ ID NO: 290) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Leu-Cys))-D-Ala-His-D- 
                 — 
                 4.72 
                 0.428 
                 — 
               
               
                 Phe-Arg-Trp-Cys]-NH 2  (SEQ ID NO: 290) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Ile-Cys))-D-Ala-His-D- 
                 — 
                 8.51 
                 1.85 
                 — 
               
               
                 Phe-Arg-Trp-Cys]-NH 2  (SEQ ID NO: 290) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(A6c-Cys))-D-Ala-His-D- 
                 — 
                 5.66 
                 1.72 
                 — 
               
               
                 Phe-Arg-Trp-Cys]-NH 2  (SEQ ID NO: 290) 
               
               
                   
               
               
                 c[Hydantoin(C(O)-(Gly-Cys))-Glu-His-D- 
                 14.5 
                 21.8 
                 0.576 
                 1780 
               
               
                 Phe-Arg-Trp-Cys]-NH 2  (SEQ ID NO: 291) 
               
               
                   
               
             
          
         
       
     
                                           TABLE 12                   cAMP Bioassay Data for Selected Compounds                EC 50     EC 50     EC 50     EC 50         Compound   hMC1-R   hMC3-R   hMC4-R   hMC5-R               Ac-Tyr-Arg-c(Cys-D-Ala-His-D-   6.42   2.39   0.194   1540       Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 292)               Ac-2-Nal-Arg-c(Cys-D-Ala-His-D-   9.66   6.11   0.275   1730       Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 292)               Ac-1-Nal-Arg-c(Cys-D-Ala-His-D-   8.67   4.21   0.363   1320       Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 292)               Ac-Trp-Arg-c(Cys-D-Ala-His-D-   5.78   3.95   0.219   2580       Phe-Arg-Trp-Cys)-NH 2  (SEQ ID NO: 292)                    
In Vivo Studies
 
     Compounds of the present invention can be and were tested for an effect upon insulin resistance and/or body weight according to the following procedures. One skilled in the art would know that procedures similar to those described herein may be used to assay the effect of the compounds of the invention upon insulin resistance and/or body weight. 
     Ligand compounds activating melanocortin receptors tested in the in vivo studies were as follows (Table 13): 
                         TABLE 13               Ligand Code   Structure                   Compound A   Ac-Arg-c(Cys-D-Ala-His-D-Phe-Arg-Trp-           Cys)-NH 2  SEQ ID NO: 50               Compound B   Hydantoin(C(O)-(Arg-Gly))-c(Cys-Glu-           His-D-Phe-Arg-Trp-Cys)-NH 2             (SEQ ID NO: 278)                    
Acute Feeding Experiments (Fasting)
 
     Male Sprague Dawley rats (250 g) were housed in individual cages and maintained under 12:12 hour light:dark conditions. The rats were fasted for 18 hours prior to the start of the experiment with water available ad libitum. At time 0, the rats were injected subcutaneously (sc) with selected compounds at doses of 100 nmole/kg, or with vehicle, and were provided with food. Individual food consumption was measured at about 2, 4 and 6 hours after injection. Data for selected compounds of the invention are reported in  FIG. 1 . 
     Chronic Feeding Experiments 
     Male, Sprague Dawley rats that had been fed either a normal diet (300 g; Research Diets 12450) or a high fat diet (400 g; Research Diets 12451) for 10 weeks prior to the start of the experiment were housed in individual cages and maintained under 12:12 hour light:dark conditions with both food and water available ad libitum. The rats were anesthetized and implanted subcutaneously with an osmotic mini pump (Alzet, Cupertino, Calif.). The pumps delivered either Compound A or Compound B at doses of 75, 300 or 1200 nmole/kg/day, or vehicle for 7 days. Individual body weight and food consumption were measured daily. 
     On day 7 rats were anesthetized and fit with a jugular-right atrial cannula. On day 8 an iv glucose tolerance test was performed and blood samples were withdrawn into heparinized syringes at time −10 and 0. Immediately after the time 0 blood sample, the rats were injected with glucose (1 g/kg) via the indwelling cannula. Subsequent blood samples were withdrawn at 2.5, 5, 10, 20 and 40 minutes later. Plasma levels of glucose (Diagnostic Chemicals Limited) and insulin (Alpco) were determined by commercially available kits. Results are shown in  FIGS. 2A-D  and  3 A-D. 
     Glucose Tolerance Tests 
     Male, C57BL/6 mice that had been fed either a normal diet (30 g; Research Diets 12450) or a high fat diet (45 g; Research Diets 12452) for 12 weeks prior to the start of the experiment were housed in individual cages and maintained under 12:12 hour light:dark conditions with both food and water available ad libitum. The mice were anesthetized and implanted subcutaneously with an osmotic mini pump (Alzet, Cupertino, Calif.). The pumps delivered Compound A at doses of 200, 600 or 1800 nmole/kg/day, or vehicle for 14 days. On day 14 the mice were fasted for 18 hours or overnight. On day 15 an glucose tolerance test was performed by injecting the mice with glucose (2 g/kg) ip. Blood samples were taken by tail stick at 0, 15, 30, 60 and 180 minutes after the glucose injection and blood glucose level was measured using an Accu-Chek glucometer. Results are shown in  FIG. 4 . 
     Male, Lep ob /Lep ob  mice (50 g) were group housed maintained under 12:12 hour light:dark conditions with both food and water available ad libitum. The mice were fasted for 18 hours or overnight and an ip glucose tolerance test was performed. Mice were injected with Compound A ip at a dose of 6.4 μmole/kg at −15 minutes and a blood sample was taken by tail stick. At time 0 mice were injected ip with glucose (1 g/kg) and blood samples were taken by tail stick at 0, 15, 30, 60 and 90 minutes later and blood glucose level was measured using Glucometer Elite XL (Bayer Corporation). Results are shown in  FIG. 5 . 
     Administration and Use 
     The peptides of this invention can be provided in the form of pharmaceutically acceptable salts. Examples of such salts include, but are not limited to, those formed with organic acids (e.g., acetic, lactic, maleic, citric, malic, ascorbic, succinic, benzoic, methanesulfonic, toluenesulfonic, or pamoic acid), inorganic acids (e.g., hydrochloric acid, sulfuric acid, or phosphoric acid), and polymeric acids (e.g., tannic acid, carboxymethyl cellulose, polylactic, polyglycolic, or copolymers of polylactic-glycolic acids). A typical method of making a salt of a peptide of the present invention is well known in the art and can be accomplished by standard methods of salt exchange. Accordingly, the TFA salt of a peptide of the present invention (the TFA salt results from the purification of the peptide by using preparative HPLC, eluting with TFA containing buffer solutions) can be converted into another salt, such as an acetate salt, by dissolving the peptide in a small amount of 0.25 N acetic acid aqueous solution. The resulting solution is applied to a semi-prep HPLC column (Zorbax®, 300 SB, C-8). The column is eluted with: (1) 0.1N ammonium acetate aqueous solution for 0.5 hours; (2) 0.25N acetic acid aqueous solution for 0.5 hours; and (3) a linear gradient (20% to 100% of solution B over 30 minutes) at a flow rate of 4 ml/min (solution A is 0.25N acetic acid aqueous solution; solution B is 0.25N acetic acid in acetonitrile/water, 80:20). The fractions containing the peptide are collected and lyophilized to dryness. 
     As is well known to those skilled in the art, the known and potential uses of peptides with melanocortin receptor (MC-R) agonist or antagonist activity is varied and multitudinous, thus the administration of the compounds of this invention for purposes of eliciting an agonist effect can have the same effects and uses as melanocortin itself. 
     Accordingly, the present invention includes within its scope pharmaceutical compositions comprising, as an active ingredient, at least one of the compounds of formula (I) in association with a pharmaceutically acceptable carrier. 
     The dosage of active ingredient in the compositions of this invention may be varied; however, it is necessary that the amount of the active ingredient be such that a suitable dosage form is obtained. The selected dosage depends upon the desired therapeutic effect, on the route of administration, and on the duration of the treatment. In general, an effective dosage for the activities of this invention is in the range of 1×10 −7  to 200 mg/kg/day, preferably 1×10 −4  to 100 mg/kg/day which can be administered as a single dose or divided into multiple doses. 
     The compounds of this invention can be administered by oral, parenteral (e.g., intramuscular, intraperitoneal, intravenous or subcutaneous injection, or implant), nasal, vaginal, rectal, sublingual or topical routes of administration and can be formulated with pharmaceutically acceptable carriers to provide dosage forms appropriate for each route of administration. 
     Solid dosage forms for oral administration include capsules, tablets, pills, powders and granules. In such solid dosage forms, the active compound is admixed with at least one inert pharmaceutically acceptable carrier such as sucrose, lactose, or starch. Such dosage forms can also comprise, as is normal practice, additional substances other than such inert diluents, e.g., lubricating agents such as magnesium stearate. In the case of capsules, tablets and pills, the dosage forms may also comprise buffering agents. Tablets and pills can additionally be prepared with enteric coatings. 
     Liquid dosage forms for oral administration include pharmaceutically acceptable emulsions, solutions, suspensions, syrups, the elixirs containing inert diluents commonly used in the art, such as water. Besides such inert diluents, compositions can also include adjuvants, such as wetting agents, emulsifying and suspending agents, and sweetening, flavoring and perfuming agents. 
     Preparations according to this invention for parenteral administration include sterile aqueous or non-aqueous solutions, suspensions, or emulsions. Examples of non-aqueous solvents or vehicles are propylene glycol, polyethylene glycol, vegetable oils, such as olive oil and corn oil, gelatin, and injectable organic esters such as ethyl oleate. Such dosage forms may also contain adjuvants such as preserving, wetting, emulsifying, and dispersing agents. Preparations may be sterilized by, for example, filtration through a bacteria-retaining filter, by incorporating sterilizing agents into the compositions, by irradiating the compositions, or by heating the compositions. Preparations can also be manufactured in the form of sterile solid compositions which can be dissolved in sterile water or some other sterile injectable medium immediately before use. 
     Compositions for rectal or vaginal administration are preferably suppositories which may contain, in addition to the active substance, excipients such as cocoa butter or a suppository wax. 
     Compositions for nasal or sublingual administration are also prepared with standard excipients well known in the art. 
     Further, a compound of this invention can be administered in a sustained release composition such as those described in the following patents and patent applications. U.S. Pat. No. 5,672,659 teaches sustained release compositions comprising a bioactive agent and a polyester. U.S. Pat. No. 5,595,760 teaches sustained release compositions comprising a bioactive agent in a gelable form. U.S. Pat. No. 5,821,221 teaches polymeric sustained release compositions comprising a bioactive agent and chitosan. U.S. Pat. No. 5,916,883 teaches sustained release compositions comprising a bioactive agent and cyclodextrin. The teachings of the foregoing patents and applications are incorporated herein by reference.