Patent ID: 7897721

Claim:
A synthetic cyclic peptide of the structural formula I: or a pharmaceutically acceptable salt thereof, wherein: R 2 is H, a C 1 to C 6 aliphatic linear or branched chain, or an aromatic amino acid side chain moiety comprising at least one 6-membered carbocyclic aromatic ring; R 3 and R 5 are independently each an aromatic amino acid side chain moiety; R 4 is a C 1 to C 6 linear or branched chain amino acid side chain or a neutral hydrogen bonding or positively charged amino acid side chain moiety; R 6 is in each instance H; R 7 is H, an aliphatic L- or D-amino acid, an N-acylated L- or D-amino acid, a linear or branched C 1 to C 17 alkyl, aryl, heteroaryl, alkene, alkenyl, or aralkyl chain, a C 1 to C 17 aliphatic linear or branched chain, optionally with a terminal amino group, or an acylated C 1 to C 17 aliphatic linear or branched chain, optionally with a terminal amino group; and m is 1 to 4, and p is 1 to 5, provided that m+p is 2 to 7.