Abstract:
The present invention relates to protracted human insulin derivatives in which the A21 and the B3 amino acid residues are, independently, any amino acid residue which can be coded for by the genetic code except Lys, Arg and Cys; Phe B1  may be deleted; the B30 amino acid residue is (a) a non-codable, lipophilic amino acid having from 10 to 24 carbon atoms, in which case an acyl group of a carboxylic acid with up to 5 carbon atoms is bound to the ε-amino group of Lys B29 ; or (b) the B30 amino acid residue is deleted or is any amino acid residue which can be coded for by the genetic code except Lys, Arg and Cys, in any of which cases the ε-amino group of Lys B29  has a lipophilic substituent; and any Zn 2+  complexes thereof with the proviso that when B30 is Thr or Ala and A21 and B3 are both Asn, and Phe B1  is present, then the insulin derivative is always present as a Zn 2+  complex.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a divisional of application Ser. No. 08/975,365 filed Nov. 20, 1997 now U.S. Pat. No. 6,011,007, which is a continuation-in-part of application Ser. No. 08/400,256 filed Mar. 8, 1995, now U.S. Pat. No. 5,750,497, which is a continuation-in-part of application Ser. No. 08/190,829 filed Feb. 2, 1994, now abandoned, and serial no. PCT DK94 00347 filed Sep. 16, 1994, now abandoned, which claims priority under 35 USC 119 of Danish application no. 194493 filed Sep. 17, 1993, the contents of which are fully incorporated herein by reference. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to novel human insulin derivatives which are soluble and have a protracted profile of action, to a method of providing such derivatives, to pharmaceutical compositions containing them, and to the use of such insulin derivatives in the treatment of diabetes. 
     BACKGROUND OF THE INVENTION 
     Many diabetic patients are treated with multiple daily insulin injections in a regimen comprising one or two daily injections of a protracted insulin to cover the basal requirement supplemented by bolus injections of a rapid acting insulin to cover the requirement related to meals. 
     Protracted insulin compositions are well known in the art. Thus, one main type of protracted insulin compositions comprises injectable aqueous suspensions of insulin crystals or amorphous insulin. In these compositions, the insulin compounds utilized typically are protamine insulin, zinc insulin or protamine zinc insulin. 
     Certain drawbacks are associated with the use of insulin suspensions. Thus, in order to secure an accurate dosing, the insulin particles must be suspended homogeneously by gentle shaking before a defined volume of the suspension is withdrawn from a vial or expelled from a cartridge. Also, for the storage of insulin suspensions, the temperature must be kept within more narrow limits than for insulin solutions in order to avoid lump formation or coagulation. 
     While it was earlier believed that protamines were non-immunogenic, it has now turned out that protamines can be immunogenic in man and that their use for medical purposes may lead to formation of antibodies (Samuel et al., Studies on the immunogenecity of protamines in humans and experimental animals by means of a micro-complement fixation test, Clin. Exp. Immunol. 33, pp. 252-260 (1978)). 
     Also, evidence has been found that the protamine-insulin complex is itself immunogenic (Kurtz et al., Circulating IgG antibody to protamine in patients treated with protamine-insulins. Diabetologica 25, pp. 322-324 (1983)). Therefore, with some patients the use of protracted insulin compositions containing protamines must be avoided. 
     Another type of protracted insulin compositions are solutions having a pH value below physiological pH from which the insulin will precipitate because of the rise in the pH value when the solution is injected. A drawback with these solutions is that the particle size distribution of the precipitate formed in the tissue on injection, and thus the timing of the medication, depends on the blood flow at the injection site and other parameters in a somewhat unpredictable manner. A further drawback is that the solid particles of the insulin may act as a local irritant causing inflammation of the tissue at the site of injection. 
     WO 91/12817 (Novo Nordisk A/S) discloses protracted, soluble insulin compositions comprising insulin complexes of cobalt(III). The protraction of these complexes is only intermediate and the bioavailability is reduced. 
     Human insulin has three primary amino groups: the N-terminal group of the A-chain and of the B-chain and the ε-amino group of Lys B29 . Several insulin derivatives which are substituted in one or more of these groups are known in the prior art. Thus, U.S. Pat. No. 3,528,960 (Eli Lilly) relates to N-carboxyaroyl insulins in which one, two or three primary amino groups of the insulin molecule has a carboxyaroyl group. No specifically N εB29 -substituted insulins are disclosed. 
     According to GB Patent No. 1.492.997 (Nat. Res. Dev. Corp.), it has been found that insulin with a carbamyl substitution at N εB29  has an improved profile of hypoglycaemic effect. 
     JP laid-open patent application No. 1-254699 (Kodama Co., Ltd.) discloses insulin wherein a fatty acid is bound to the amino group of Phe B1  or to the ε-amino group of Lys B29  or to both of these. The stated purpose of the derivatisation is to obtain a pharmacologically acceptable, stable insulin preparation. 
     Insulins, which in the B30 position have an amino acid having at least five carbon atoms which cannot necessarily be coded for by a triplet of nucleotides, are described in JP laid-open patent application No. 57-067548 (Shionogi). The insulin analogues are claimed to be useful in the treatment of diabetes mellitus, particularly in patients who are insulin resistant due to generation of bovine or swine insulin antibodies. 
     By “insulin derivative” as used herein is meant a compound having a molecular structure similar to that of human insulin including the disulfide bridges between Cys A7  and Cys B7  and between Cys A20  and Cys B19  and an internal disulfide bridge between Cys A6  and Cys A11 , and which have insulin activity. 
     However, there still is a need for protracted injectable insulin compositions which are solutions and contain insulins which stay in solution after injection and possess minimal inflammatory and immunogenic properties. 
     One object of the present invention is to provide human insulin derivatives, with a protracted profile of action, which are soluble at physiological pH values. 
     Another object of the present invention is to provide a pharmaceutical composition comprising the human insulin derivatives according to the invention. 
     It is a further object of the invention to provide a method of making the human insulin derivatives of the invention. 
     SUMMARY OF THE INVENTION 
     Surprisingly, it has turned out that certain human insulin derivatives, wherein the ε-amino group of Lys B29  has a lipophilic substituent, have a protracted profile of action and are soluble at physiological pH values. 
     Accordingly, in its broadest aspect, the present invention relates to an insulin derivative having the following sequence: 
                        
 
wherein
         Xaa at positions A21 and B3 are, independently, any amino acid residue which can be coded for by the genetic code except Lys, Arg and Cys;   Xaa at position B1 is Phe or is deleted;   Xaa at position B30 is (a) a noncodable, lipophilic amino acid having from 10 to 24 carbon atoms, in which case an acyl group of a carboxylic acid with up to 5 carbon atoms is bound to the ε-amino group of Lys B29 , (b) any amino acid residue which can be coded for by the genetic code except Lys, Arg and Cys, in which case the ε-amino group of Lys B29  has a lipophilic substituent or (c) deleted, in which case the ε-amino group of Lys B29  has a lipophilic substituent; and any Zn 2+  complexes thereof,provided that when Xaa at position B30 is Thr or Ala, Xaa at positions A21 and B3 are both Asn, and Xaa at position B1 is Phe, then the insulin derivative is a Zn 2+  complex.       

     In one preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid residue is deleted or is any amino acid residue which can be coded for by the genetic code except Lys, Arg and Cys; the A21 and the B3 amino acid residues are, independently, any amino acid residues which can be coded for by the genetic code except Lys, Arg and Cys; Phe B1  may be deleted; the ε-amino group of Lys B29  has a lipophilic substituent which comprises at least 6 carbon atoms; and 2-4 Zn 2+  ions may be bound to each insulin hexamer with the proviso that when B30 is Thr or Ala and A21 and B3 are both Asn, and Phe B1  is not deleted, then 2-4 Zn 2+  ions are bound to each hexamer of the insulin derivative. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid residue is deleted or is any amino acid residue which can be coded for by the genetic code except Lys, Arg and Cys; the A21 and the B3 amino acid residues are, independently, any amino acid residues which can be coded for by the genetic code except Lys, Arg and Cys, with the proviso that if the B30 amino acid residue is Ala or Thr, then at least one of the residues A21 and B3 is different from Asn; Phe B1  may be deleted; and the ε-amino group of Lys B29  has a lipophilic substituent which comprises at least 6 carbon atoms. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid residue is deleted or is any amino acid residue which can be coded for by the genetic code except Lys, Arg and Cys; the A21 and the B3 amino acid residues are, independently, any amino acid residues which can be coded for by the genetic code except Lys, Arg and Cys; Phe B1  may be deleted; the ε-amino group of Lys B29  has a lipophilic substituent which comprises at least 6 carbon atoms; and 2-4 Zn 2+  ions are bound to each insulin hexamer. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid residue is deleted. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid residue is Asp. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid residue is Glu. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid residue is Thr. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is a lipophilic amino acid having at least 10 carbon atoms. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is a lipophilic α-amino acid having from 10 to 24 carbon atoms. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is a straight chain, saturated, aliphatic α-amino acid having from 10 to 24 carbon atoms. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is D- or L-N ε -decanoyllysine. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is α-amino decanoic acid. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is α-amino undecanoic acid. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is α-amino dodecanoic acid. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is α-amino tridecanoic acid. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is α-amino tetradecanoic acid. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is α-amino pentadecanoic acid. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is α-amino hexadecanoic acid. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B30 amino acid is an α-amino acid. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the A21 amino acid residue is Ala. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the A21 amino acid residue is Gln. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the A21 amino acid residue is Gly. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the A21 amino acid residue is Ser. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B3 amino acid residue is Asp. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B3 amino acid residue is Gln. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the B3 amino acid residue is Thr. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the ε-amino group of Lys B29  has a lipophilic substituent which is an acyl group corresponding to a carboxylic acid having at least 6 carbon atoms. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the ε-amino group of Lys B29  has a lipophilic substituent which is an acyl group, branched or unbranched, which corresponds to a carboxylic acid having a chain of carbon atoms 8 to 24 atoms long. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the ε-amino group of Lys B29  has a lipophilic substituent which is an acyl group corresponding to a fatty acid having at least 6 carbon atoms. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the ε-amino group of Lys B29  has a lipophilic substituent which is an acyl group corresponding to a linear, saturated carboxylic acid having from 6 to 24 carbon atoms. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the ε-amino group of Lys B29  has a lipophilic substituent which is an acyl group corresponding to a linear, saturated carboxylic acid having from 8 to 12 carbon atoms. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the ε-amino group of Lys B29  has a lipophilic substituent which is an acyl group corresponding to a linear, saturated carboxylic acid having from 10 to 16 carbon atoms. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the ε-amino group of Lys B29  has a lipophilic substituent which is an oligo oxyethylene group comprising up to 10, preferably up to 5, oxyethylene units. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which the ε-amino group of Lys B29  has a lipophilic substituent which is an oligo oxypropylene group comprising up to 10, preferably up to 5, oxypropylene units. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which each insulin hexamer binds 2 Zn 2+  ions. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which each insulin hexamer binds 3 Zn 2+  ions. 
     In another preferred embodiment, the invention relates to a human insulin derivative in which each insulin hexamer binds 4 Zn 2+  ions. 
     In another preferred embodiment, the invention relates to the use of a human insulin derivative according to the invention for the preparation of a medicament for treating diabetes. 
     In another preferred embodiment, the invention relates to a pharmaceutical composition for the treatment of diabetes in a patient in need of such a treatment comprising a therapeutically effective amount of a human insulin derivative according to the invention together with a pharmaceutically acceptable carrier. 
     In another preferred embodiment, the invention relates to a pharmaceutical composition for the treatment of diabetes in a patient in need of such a treatment comprising a therapeutically effective amount of a human insulin derivative according to the invention, in mixture with an insulin or an insulin analogue which has a rapid onset of action, together with a pharmaceutically acceptable carrier. 
     In another preferred embodiment, the invention relates to a pharmaceutical composition comprising a human insulin derivative according to the invention which is soluble at physiological pH values. 
     In another preferred embodiment, the invention relates to a pharmaceutical composition comprising a human insulin derivative according to the invention which is a soluble at pH values in the interval from about 6.5 to about 8.5. 
     In another preferred embodiment, the invention relates to a protracted pharmaceutical composition comprising a human insulin derivative according to the invention. 
     In another preferred embodiment, the invention relates to a pharmaceutical composition which is a solution containing from about 120 nmol/ml to about 1200 nmol/ml, a preferably about 600 nmol/ml of a human insulin derivative according to the invention. 
     In another preferred embodiment, the invention relates to a method of treating diabetes in a patient in need of such a treatment comprising administering to the patient a therapeutically effective amount of an insulin derivative according to this invention together with a pharmaceutically acceptable carrier. 
     In another preferred embodiment, the invention relates to a method of treating diabetes in a patient in need of such a treatment comprising administering to the patient a therapeutically effective amount of an insulin derivative according to this invention, in mixture with an insulin or an insulin analogue which has a rapid onset of action, together with a pharmaceutically acceptable carrier. 
     Examples of preferred human insulin derivatives according to the present invention in which no Zn 2+  ions are bound are the following:
         N εB29 -tridecanoyl des(B30) human insulin,   N εB29 -tetradecanoyl des(B30) human insulin,   N εB29 -decanoyl des(B30) human insulin,   N εB29 -dodecanoyl des(B30) human insulin,   N εB29 -tridecanoyl Gly A21  des(B30) human insulin,   N εB29 -tetradecanoyl Gly A21  des(B30) human insulin,   N εB29 -decanoyl Gly A21  des(B30) human insulin,   N εB29 -dodecanoyl Gly A21  des(B30) human insulin,   N εB29 -tridecanoyl Gly A21  Gln B3  des(B30) human insulin,   N εB29 -tetradecanoyl Gly A21  Gln B3  des(B30) human insulin,   N εB29 -decanoyl Gly A21  Gln B3  des(B30) human insulin,   N εB29 -dodecanoyl Gly A21  Gln B3  des(B30) human insulin,   N εB29 -tridecanoyl Ala A21  des(B30) human insulin,   N εB29 -tetradecanoyl Ala A21  des(B30) human insulin,   N εB29 -decanoyl Ala A21  des(B30) human insulin,   N εB29 -dodecanoyl Ala A21  des(B30) human insulin,   N εB29 -tridecanoyl Ala A21  Gln B3  des(B30) human insulin,   N εB29 -tetradecanoyl Ala A21  Gln B3  des(B30) human insulin,   N εB29 -decanoyl Ala A21  Gln B3  des(B30) human insulin,   N εB29 -dodecanoyl Ala A21  Gln B3  des(B30) human insulin,   N εB29 -tridecanoyl Gln B3  des(B30) human insulin,   N εB29 -tetradecanoyl Gln B3  des(B30) human insulin,   N εB29 -decanoyl Gln B3  des(B30) human insulin,   N εB29 -dodecanoyl Gln B3  des(B30) human insulin,   N εB29 -tridecanoyl Gly A21  human insulin,   N εB29 -tetradecanoyl Gly A21  human insulin,   N εB29 -decanoyl Gly A21  human insulin,   N εB29 -dodecanoyl Gly A21  human insulin,   N εB29 -tridecanoyl Gly A21  Gln B3  human insulin,   N εB29 -tetradecanoyl Gly A21  Gln B3  human insulin,   N εB29 -decanoyl Gly A21  Gln B3  human insulin,   N εB29 -dodecanoyl Gly A21  Gln B3  human insulin,   N εB29 -tridecanoyl Ala A21  human insulin,   N εB29 -tetradecanoyl Ala A21  human insulin,   N εB29 -decanoyl Ala A21  human insulin,   N εB29 -dodecanoyl Ala A21  human insulin,   N εB29 -tridecanoyl Ala A21  Gln B3  human insulin,   N εB29 -tetradecanoyl Ala A21  Gln B3  human insulin,   N εB29 -decanoyl Ala A21  Gln B3  human insulin,   N εB29 -dodecanoyl Ala A21  Gln B3  human insulin,   N εB29 -tridecanoyl Gln B3  human insulin,   N εB29 -tetradecanoyl Gln B3  human insulin,   N εB29 -decanoyl Gln B3  human insulin,   N εB29 -dodecanoyl Gln B3  human insulin,   N εB29 -tridecanoyl Glu B30  human insulin,   N εB29 -tetradecanoyl Glu B30  human insulin,   N εB29 -decanoyl Glu B30  human insulin,   N εB29 -dodecanoyl Glu B30  human insulin,   N εB29 -tridecanoyl Gly A21  Glu B30  human insulin,   N εB29 -tetradecanoyl Gly A21  Glu B30  human insulin,   N εB29 -decanoyl Gly A21  Glu B30  human insulin,   N εB29 -dodecanoyl Gly A21  Glu B30  human insulin,   N εB29 -tridecanoyl Gly A21  Gln B3  Glu B30  human insulin,   N εB29 -tetradecanoyl Gly A21  Gln B3  Glu B30  human insulin,   N εB29 -decanoyl Gly A21    1  Gln B3  Glu B30  human insulin,   N εB29 -dodecanoyl Gly A21  Gln B3  Glu B30  human insulin,   N εB29 -tridecanoyl Ala A21  Glu B30  human insulin,   N εB29 -tetradecanoyl Ala A21  Glu B30  human insulin,   N εB29 -decanoyl Ala A21  Glu B30  human insulin,   N εB29 -dodecanoyl Ala A21  Glu B30  human insulin,   N εB29 -tridecanoyl Ala A21  Gln B3  Glu B30  human insulin,   N εB29 -tetradecanoyl Ala A21  Gln B3  Glu B30  human insulin,   N εB29 -decanoyl Ala A21  Gln B3  Glu B30  human insulin,   N εB29 -dodecanoyl Ala A21  Gln B3  Glu B30  human insulin,   N εB29 -tridecanoyl Gln B3  Glu B30  human insulin,   N εB29 -tetradecanoyl Gln B3  Glu B30  human insulin,   N εB29 -decanoyl Gln B3  Glu B30  human insulin and   N εB29 -dodecanoyl Gln B3  Glu B30  human insulin.       

     Examples of preferred human insulin derivatives according to the present invention in which two Zn 2+  ions are bound per insulin hexamer are the following:
         (N εB29 -tridecanoyl des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Gly A21  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Gly A21  Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Gly A21    1  Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Ala A21  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Gln B3  des(B30) human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Gly A21  human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Gly A21  Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Ala A21  human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Ala A21  Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Gln B3  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Gly A21  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  Gln B3  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Gln B3  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Gly A21  Gln B3  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  Gln B3  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Ala A21  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -tetradecanoyl Gln B3  Glu B30  human insulin) 6 , 2Zn 2+ ,   (N εB29 -decanoyl Gln B3  Glu B30  human insulin) 6 , 2Zn 2+  and   (N εB29 -dodecanoyl Gln B3  Glu B30  human insulin) 6 , 2Zn 2+ .       

     Examples of preferred human insulin derivatives according to the present invention in which three Zn 2+  ions are bound per insulin hexamer are the following:
         (N εB29 -tridecanoyl des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Gly A21  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Gly A21  Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Ala A21  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Gln B3  des(B30) human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Gly A21  human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  Gln B3  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Gln B3  human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Gly A21  Gln B3  human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  Gln B3  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Ala A21  human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Gln B3  human insulin) 6 , 3Zn 1+ ,   (N εB29 -tetradecanoyl Ala A21  Gln B3  human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Ala A21  Gln B3  human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Gln B3  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Gln B3  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Gln B3  human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Gln B3  human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Gln B3  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Gly A21  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Gln B3  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Gly A21  Gln B3  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  Gln B3  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Ala A21  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -tridecanoyl Gln B3  Glu B30  human insulin) 6 , 3Z 2+ ,   (N εB29 -tetradecanoyl Gln B3  Glu B30  human insulin) 6 , 3Zn 2+ ,   (N εB29 -decanoyl Gln B3  Glu B30  human insulin) 6 , 3Zn 2+  and   (N εB29 -dodecanoyl Gln B3  Glu B30  human insulin) 6 , 3Zn 2+.          

     Examples of preferred human insulin derivatives according to the present invention in which four Zn 2+  ions are bound per insulin hexamer are the following:
         (N εB29 -tridecanoyl des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Gly A21  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Gly A21  Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Ala A21  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Gln B3  des(B30) human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Gly A21  human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Gly A21  Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Ala A21  human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Ala A21  Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Gln B3  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Gly A21  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Gly A21  Gln B3  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Gly A21  Gln B3  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Gly A21  Gln B3  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Gly A21  Gln B3  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  Glu B30  human insulin) 6,  4Zn 2+ ,   (N εB29 -decanoyl Ala A21  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -dodecanoyl Ala A21  Gln B3  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tridecanoyl Gln B3  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -tetradecanoyl Gln B3  Glu B30  human insulin) 6 , 4Zn 2+ ,   (N εB29 -decanoyl Gln B3  Glu B30  human insulin) 6 , 4Zn 2+  and   (N εB29 -dodecanoyl Gln B3  Glu B30  human insulin) 6 , 4Zn 2+.         

    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention is further illustrated with reference to the appended drawings wherein 
         FIG. 1  shows the construction of the plasmid pEA5.3.2; 
         FIG. 2  shows the construction of the plasmid pEA108; and 
         FIG. 3  shows the construction of the plasmid pEA113. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Terminology 
     The three letter codes and one letter codes for the amino acid residues used herein are those stated in J. Biol. Chem. 243, p. 3558 (1968). 
     In the DNA sequences, A is adenine, C is cytosine, G is guanine, and T is thynine. 
     The following acronyms are used: 
     DMSO for dimethyl sulphoxide, DMF for dimethylformamide, Boc for tert-butoxycarbonyl, RP-HPLC for reversed phase high performance liquid chromatography, X-OSu is an N-hydroxysuccinimid ester, X is an acyl group, and TFA for trifluoroacetic acid. 
     Preparation of Lipophilic Insulin Derivatives 
     The insulin derivatives according to the present invention can be prepared i.a. as described in the following: 
     1. Insulin Derivatives Featuring in Position B30 an Amino Acid Residue which can be Coded for by the Genetic Code. e.g. Threonine (Human Insulin) or Alanine (Porcine Insulin) 
     1.1 Starting from Human Insulin. 
     Human insulin is treated with a Boc-reagent (e.g. di-tert-butyl dicarbonate) to form (A1,B1)-diBoc human insulin, i.e., human insulin in which the N-terminal end of both chains are protected by a Boc-group. After an optional purification, e.g. by HPLC, an acyl group is introduced in the ε-amino group of Lys B29  by allowing the product to react with a N-hydroxysuccinimide ester of the formula X-OSu wherein X is the acyl group to be introduced. In the final step, TFA is used to remove the Boc-groups and the product, N εB29 -X human insulin, is isolated. 
     1.2 Starting from a Single Chain Insulin Precursor. 
     A single chain insulin precursor, extended in position B1 with an extension (Ext) which is connected to B1 via an arginine residue and in which the bridge from B30 to A1 is an arginine residue, i.e. a compound of the general formula Ext-Arg-B(1-30)-Arg-A(1-21), can be used as starting material. Acylation of this starting material with a N-hydroxysuccinimide ester of the general formula X-OSu wherein X is an acyl group, introduces the acyl group X in the ε-amino group of Lys B29  and in the N-terminal amino group of the precursor. On treating this acylated precursor of the formula (N εB29 -X), X-Ext-Arg-B(1-30)-Arg-A(1-21) with trypsin in a mixture of water and a suitable water-miscible organic solvent, e.g. DMF, DMSO or a lower alcohol, an intermediate of the formula (N εB29 -X), Arg B31  insulin is obtained. Treating this intermediate with carboxypeptidase B yields the desired product, (N εB29 -X) insulin. 
     2. Insulin Derivatives with no Amino Acid Residue in Position B30, i.e. des(B30) Insulins 
     2.1 Starting from Human Insulin or Porcine Insulin. 
     On treatment with carboxypeptidase A in ammonium buffer, human insulin and porcine insulin both yield des(B30) insulin. After an optional purification, the des(B30) insulin is treated with a Boc-reagent (e.g. di-tert-butyl dicarbonate) to form (A1,B1)diBoc des(B30) insulin, i.e., des(B30) insulin in which the N-terminal end of both chains are protected by a Boc-group. After an optional purification, e.g. by HPLC, an acyl group is introduced in the ε-amino group of Lys B29  by allowing the product to react with a N-hydroxysuccinimide ester of the formula X-OSu wherein X is the acyl group to be introduced. In the final step, TFA is used to remove the Boc-groups and the product, (N εB29 -X) des(B30) insulin, is isolated. 
     2.2 Starting from a Single Chain Human Insulin Precursor. 
     A single chain human insulin precursor, which is extended in position B1 with an extension (Ext) which is connected to B1 via an arginine residue and which has a bridge from B30 to A1 can be a useful starting material. Preferably, the bridge is a peptide of the formula Y n -Arg, where Y is a codable amino acid except lysine and arginine, and n is zero or an integer between 1 and 35. When n22 1, the Y&#39;s may designate different amino acids. Preferred examples of the bridge from B30 to A1 are: AlaAlaArg, SerArg, SerAspAspAlaArg and Arg (European Patent No. 163529). Treatment of such a precursor of the general formula Ext-Arg-B(1-30)-Y n -Arg-A(1-21) with a lysyl endopeptidase, e.g.  Achromobacter lyticus  protease, yields Ext-Arg-B(1-29) Thr-Y n -Arg-A(1-21) des(B30) insulin. Acylation of this intermediate with a N-hydroxysuccinimide ester of the general formula X-OSu wherein X is an acyl group, introduces the acyl group X in the ε-amino group of Lys B29 , and in the N-terminal amino group of the A-chain and the B-chain to give (N εB29 -X) X-Ext-Arg-B(1-29) X-Thr-Y n -Arg-A(1-21) des(B30) insulin. This intermediate on treatment with trypsin in mixture of water and a suitable organic solvent, e.g. DMF, DMSO or a lower alcohol, gives the desired derivative, (N εB29 -X) des(B30) human insulin. 
     Data on N εB29  Modified Insulins. 
     Certain experimental data on N εB29  modified insulins are given in Table 1. 
     The lipophilicity of an insulin derivative relative to human insulin, k′ rel , was measured on a LiChrosorb RP18 (5 μm, 250×4 mm) HPLC column by isocratic elution at 40° C. using mixtures of A) 0.1 M sodium phosphate buffer, pH 7.3, containing 10% acetonitrile, and B) 50% acetonitrile in water as eluents. The elution was monitored by following the UV absorption of the eluate at 214 nm. Void time, t 0 , was found by injecting 0.1 mM sodium nitrate. Retention time for human insulin, t human , was adjusted to at least 2t 0  by varying the ratio between the A and B solutions. k′ rel =(t derivative −t 0 )/(t human −t 0 ). 
     The degree of prolongation of the blood glucose lowering effect was studied in rabbits. Each insulin derivative was tested by subcutaneous injection of 12 nmol thereof in, each of six rabbits in the single day retardation test. Blood sampling for glucose analysis was performed before injection and at 1, 2, 4 and 6 hours after injection. The glucose values found are expressed as percent of initial values. The Index of Protraction, which was calculated from the blood glucose values, is the scaled Index of Protraction (prolongation), see p. 211 in Markussen et al., Protein Engineering 1 (1987) 205-213. The formula has been scaled to render a value of 100 with bovine ultralente insulin and a value of 0 with Actrapid® insulin (Novo Nordisk A/S, 2880 Bagsvaerd, Denmark). 
     The insulin derivatives listed in Table 1 were administered in solutions containing 3 Zn 2+  per insulin hexamer, except those specifically indicated to be Zn-free. 
     For the very protracted analogues the rabbit model is inadequate because the decrease in blood glucose from initial is too small to estimate the index of protraction. The prolongation of such analogues is better characterized by the disappearance rate in pigs. T 50%  is the time when 50% of the A14 Tyr( 125 I) analogue has disappeared from the site of injection as measured with an external γ-counter (Ribel, U et al., The Pig as a Model for Subcutaneous Absorption in Man. In: M. serrano-Rios and P. J. Lefebre (Eds): Diabetes 1985; Proceedings of the 12th Congress of the International Diabetes Federation, Madrid, Spain, 1985 (Excerpta Medica, Amsterdam, (1986) 891-96). 
     In Table 2 are given the T 50%  values of a series of very protracted insulin analogues. The analogues were administered in solutions containing 3 Zn 2+  per insulin hexamer. 
                                                                                                 TABLE 1                           Relative   Blood glucose, % of initial   Index of            Insulin Derivative *)   Lipophilicity   1 h   2 h   4 h   6 h   protraction                    N εB29 -benzoyl insulin   1.14                           N εB29 -phenylacetyl insulin (Zn-free)   1.28   55.4   58.9   88.8   90.1   10       N εB29 -cyclohexylacetyl insulin   1.90   53.1   49.6   66.9   81.1   28       N εB29 -cyclohexylpropionyl insulin   3.29   55.5   47.6   61.5   73.0   39       N εB29 -cyclohexylvaleroyl insulin   9.87   65.0   58.3   65.7   71.0   49       N εB29 -octanoyl insulin   3.97   57.1   54.8   69.0   78.9   33       N εB29 -decanoyl, des-(B30) insulin   11.0   74.3   65.0   60.9   64.1   65       N εB29 -decanoyl insulin   12.3   73.3   59.4   64.9   68.0   60       N εB29 -undecanoyl, des-(B30) insulin   19.7   88.1   80.0   72.1   72.1   80       N εB29 -lauroyl, des-(B30) insulin   37.0   91.4   90.0   84.2   83.9   78       N εB29 -myristoyl insulin   113   98.5   92.0   83.9   84.5   97       N εB29 -choloyl insulin   7.64   58.2   53.2   69.0   88.5   20       N εB29 -7-deoxycholoyl insulin (Zn-free)   24.4   76.5   65.2   77.4   87.4   35       N εB29 -lithocholoyl insulin (Zn-free)   51.6   98.3   92.3   100.5   93.4   115       N εB29 -4-benzoyl-phenylalanyl insulin   2.51   53.9   58.7   74.4   89.0   14       N εB29 -3,5-diiodotyrosyl insulin   1.07   53.9   48.3   60.8   82.1   27       N εB29 -L-thyroxyl insulin   8.00               *) 3 Zn 2+ /insulin hexamer except where otherwise indicated.             
Solubility
 
     The solubility of all the N εB29  modified insulins mentioned in Table 1, which contain 3 Zn 2+  ions per insulin hexamer, exceeds 600 nmol/ml in a neutral (H 7.5), aqueous, pharmaceutical formulation which further comprises 0.3% phenol as preservative, and 1.6% glycerol to achieve isotonicity. 600 nmol/ml is the concentration of human insulin found in the 100 IU/ml compositions usually employed in the clinic. 
     The ε-B29 amino group can be a component of an amide bond, a sulphonamide bond, a carbamide a thiocarbamide, or a carbamate. The lipophilic substituent carried by the ε-B29 amino group can also be an alkyl group. 
     Pharmaceutical compositions containing a human insulin derivative according to the present invention may be administered parenterally to patients in need of such a treatment. Parenteral administration may be performed by subcutaneous, intramuscular or intravenous injection by means of a syringe, optionally a pen-like syringe. Alternatively, parenteral administration can be performed by means of an infusion pump. A further option is a composition which may be a powder or a liquid for the administration of the human insulin derivative in the form of a nasal spray. 
     The injectable human insulin compositions of the invention can be prepared using the conventional techniques of the pharmaceutical industry which involves dissolving and mixing the ingredients as appropriate to give the desired end product. 
     Thus, according to one procedure, the human insulin derivative is dissolved in an amount of water which is somewhat less than the final volume of the composition to be prepared. An isotonic agent, a preservative and a buffer is added as required and the pH value of the solution is adjusted—if necessary—using an acid, e.g. hydrochloric acid, or a is base, e.g. aqueous sodium hydroxide as needed. Finally, the volume of the solution is adjusted with water to give the desired concentration of the ingredients. 
     Examples of isotonic agents are sodium chloride, mannitol and glycerol. 
     Examples of preservatives are phenol, m-cresol, methyl p-hydroxybenzoate and benzyl alcohol. 
     Examples of suitable buffers are sodium acetate and sodium phosphate. 
     A composition for nasal administration of an insulin derivative according to the present invention may, for example, be prepared as described in European Patent No. 272097 (to Novo Nordisk A/S). 
     The insulin compositions of this invention can be used in the treatment of diabetes. The optimal dose level for any patient will depend on a variety of factors including the efficacy of the specific human insulin derivative employed, the age, body weight, physical activity, and diet of the patient, on a possible combination with other drugs, and on the severity of the case of diabetes. It is recommended that the daily dosage of the human insulin derivative of this invention be determined for each individual patient by those skilled in the art in a similar way as for known insulin compositions. 
     Where expedient, the human insulin derivatives of this invention may be used in mixture with other types of insulin, e.g. human insulin or porcine insulin or insulin analogues with a more rapid onset of action. Examples of such insulin analogues are described e.g. in the European patent applications having the publication Nos. EP 214826 (Novo Nordisk A/S), EP 375437 (Novo Nordisk A/S) and EP 383472 (Eli Lilly &amp;. Co.). 
     The present invention is further illustrated by the following examples which, however, are not to be construed as limiting the scope of protection. The features disclosed in the foregoing description and in the following examples may, both separately and in any combination thereof, be material for realizing the invention in diverse forms thereof. 
     EXAMPLES 
     Plasmids and DNA Material 
     All expression plasmids are of the cPOT type. Such plasmids are described in EP patent application No. 171 142 and are characterized in containing the  Schizosaccharomyces pombe  triose phosphate isomerase gene (POT) for the purpose of plasmid selection and stabilization. A plasmid containing the POT-gene is available from a deposited  E. coli  strain (ATCC 39685). The plasmids furthermore contain the  S. cerevisiae  triose phosphate isomerase promoter and terminator (P TPI  and T TPI ). They are identical to pMT742 (Egel-Mitani, M. et al.  Gene  73 (1988) 113≧120) (see  FIG. 1 ) except for the region defined by the ECoRI-XbaI restriction sites encompassing the coding region for signal/leader/product. 
     Synthetic DNA fragments were synthesized on an automatic DNA synthesizer (Applied Biosystems model 380A) using phosphoramidite chemistry and commercially available reagents (Beaucage, S. L. and Caruthers, M. H.,  Tetrahedron Letters  22 (1981) 1859-1869). 
     All other methods and materials used are common state of the art knowledge (see, e.g. Sambrook, J., Fritsch, E. F. and Maniatis, T.,  Molecular Cloning: A Laboratory Manual , Cold Spring Harbor Laboratory Press, New York, 1989). 
     Analytical 
     Molecular masses of the insulins prepared were obtained by MS (mass spectroscopy), either by PDMS (plasma desorption mass spectrometry) using a Bio-Ion 20 instrument (Bio-Ion Nordic AB, Uppsala, Sweden) or by ESMS (electrospray mass spectrometry) using an API III Biomolecular Mass Analyzer (Perkin-Elmer Sciex Instruments, Thornhill, Canada). 
     Example 1 
     Synthesis of Ala A21  Asp B3  Human Insulin Precursor from Yeast Strain yEA002 using the LaC212spx3 Signal/leader 
     The following oligonucleotides were synthesized:
         #98 5′-TGGCTAAGAGATTCGTTGACCAACACTTGTGCGGTTCTCACTTGGTTGAA GCTTTGTACTTGGTTTGTGGTGAAAGAGGTTTCTTCTACACTCCAAAGTCTGA CGACGCT-3′ (Asp B3 ) (SEQ ID NO:3)   #128 5′-CTGCGGGCTGCGTCTAAGCACAGTAGTTTTCCAATTGGTACAAAGAACAG ATAGAAGTACAACATTGTTCAACGATACCCTTAGCGTCGTCAGACTTTGG-3′ (Ala A21 ) (SEQ ID NO:4)   #126 5′-GTCGCCATGGCTAAGAGATTCGTTG-3′ (Asp B3 ) (SEQ ID NO:5)   #16 5′-CTGCTCTAGAGCCTGCGGGCTGCGTCT-3′ (SEQ ID NO:6)       

     The following Polymerase Chain Reaction (PCR) was performed using the Gene Amp PCR reagent kit (Perkin Elmer, 761 Main Avewalk, Conn. 06859, USA) according to the manufacturer&#39;s instructions. In all cases, the PCR mixture was overlayed with 100 μl of mineral oil (Sigma Chemical Co., St. Louis, Mo., USA).
         2.5 μl of oligonucleotide #98 (2.5 pmol)   2.5 μl of oligonucleotide #128 (2.5 pmol)   10 μl of 10×PCR buffer   16 μl of dNTP mix   0.54 μl of Taq enzyme   58.5 μl of water       

     One cycle was performed: 94° C. for 45 sec., 49° C. for 1 min, 72° C. for 2 min. 
     Subsequently, 5 μl of oligonucleotides #16 and #126 was added and 15 cycles were performed: 94° C. for 45 sec., 45° C. for 1 min, 72° C. for 1.5 min. The PCR mixture was loaded onto a 2.5% agarose gel and subjected to electrophoresis using standard techniques (Sambrook et al., Molecular cloning, Cold Spring Harbour Laboratory Press, 1989). The resulting DNA fragment was cut out of the agarose get and isolated using the Gene Clean Kit (Bio 101 Inc., PO BOX. 2284, La Jolla, Calif. 92038, USA) according to the manufacturer&#39;s instructions. The purified PCR DNA fragment was dissolved in 10 μl of water and restriction endonuclease buffer and cut with the restriction endonucleases NcoI and XbaI according to standard techniques, run on a 2.5% agarose gel and purified using the Gene Clean Kit as described. 
     The plasmid pAK188 consists of a DNA sequence of 412 bp composed of a EcoRI/NcoI fragment encoding the synthetic yeast signal/leader gene LaC212spx3 (described in Example 3 of WO 89/02463) followed by a synthetic NcoI/XbaI fragment encoding the insulin precursor MI5, which has a SerAspAspAlaLys bridge connecting the B29 and the A1 amino acid residues (see SEQ ID NOS. 14, 15 and 16), inserted into the EcoRI/XbaI fragment of the vector (phagemid) pBLUESCRIPT IIsk(+/−)(Stratagene, USA). The plasmid pAK188 is shown in FIG.  1 . 
     The plasmid pAk188 was also cut with the restriction endonucleases NcoI and XbaI and the vector fragment of 3139 bp isolated. The two DNA fragments were ligated together using T4 DNA ligase and standard conditions (Sambrook et al., Molecular Cloning, Cold Spring Harbour Laboratory Press, 1989). The ligation mixture was transformed into a competent  E. coli  strain (R−, M+) followed by selection for ampicillin resistance. Plasmids were isolated from the resulting  E. coli  colonies using standard DNA miniprep technique (Sambrook et al., Molecular Cloning, Cold Spring Harbour Laboratory Press, 1989), checked with appropriate restrictions endonucleases i.e. EcoRI, XbaI, NcoI and HpaI. The selected plasmid was shown by DNA sequencing analyses (Sequenase, U.S. Biochemical Corp.) to contain the correct sequence for the Ala A21 , Asp B3  human insulin precursor and named pEA5.3. 
     The plasmid pKFN1627 is an  E. coli - S. cerevisiae  shuttle vector, identical to plasmid pKFN1003 described in EP patent No. 375718, except for a short DNA sequence upstream from the unique XbaI site. In pKFN1003, this sequence is a 178 bp fragment encoding a synthetic aprotinin gene fused in-frame to the yeast mating factor alpha 1 signal-leader sequence. In pKFN1627, the corresponding 184 bp sequence encodes the insulin precursor MI5 (Glu B1 , Glu B28 ) (i.e. B(1-29, Glu B1 , Glu B28 )-SerAspAspAlaLys-A(1-21) fused in-frame to the mating factor alpha 1 sequence (see SEQ ID NOS. 17, 18 and 19). The vector pKFN1627 is shown in FIG.  1 . 
     pEA5.3 was cut with the restriction endonucleases EcoRI and XbaI and the resulting DNA fragment of 412 bp was isolated. The yeast expression vector pKFN1627 was cut with the restriction endonucleases NcoI and XbaI and with NcoI and EcoRI and the DNA fragment of 9273 bp was isolated from the first digestion and the DNA fragment of 1644 bp was isolated from the second. The 412 bp EcoRI/XbaI fragment was then ligated to the two other fragments, that is the 9273 bp NcoII/XbaI fragment and the 1644 bp NcoI/EcoRI fragment using standard techniques. 
     The ligation mixture was transformed into  E. coli  as described above. Plasmid from the resulting  E. coli  was isolated using standard techniques, and checked with appropriate restriction endonucleases i.e. EcoRI, XbaI, NcoI, HpaI. The selected plasmid was shown by DNA sequence analysis (using the Sequenase kit as described by the manufacturer, U.S. Biochemical) to contain the correct sequence for the Ala A21  Asp B3  human insulin precursor DNA and to be inserted after the DNA encoding the LaC212spx3 signal/leader DNA. The plasmid was named pEA5.3.2 and is shown in FIG.  1 . The DNA sequence encoding the LaC212spx3 signal/leader/Ala A21  Asp B3  human insulin precursor complex and the amino acid sequence thereof are SEQ ID NOS. 20, 21 and 22. The plasmid pEA5.3.2 was transformed into  S. cervisiae  strain MT663 as described in European patent application having the publication No. 214826 and the resulting strain was named yEA002. 
     Example 2 
     Synthesis of Ala A21  Thr B3  Human Insulin Precursor from Yeast Strain yEA005 using the LaC212spx3 Signal/leader 
     The following oligonucleotides were synthesized:
         #101 5′-TGGCTAAGAGATTCGTTACTCAACACTTGTGCGGTTCTCACTT GGTTGAAGCTTTGTACTTGGTTGTGGTGAAAGAGGTTTCTTCTACA CTCCAAAGTCTGACGACGCT-3′ (Thr B3 ) (SEQ ID NO:7)   #128 5′-CTGCGGGCTGCGTCTAAGCACAGTAGTTMTCCAATTGGTACAAA GAACAGATAGAAGTACAACATTGTTCAACGATACCCTTAGCGTCG TCAGACTTTGG-3′ (Ala A21 ) (SEQ ID NO:4)   #15 5′-GTCGCCATGGCTAAGAGATTCGTTA-3′ (Thr B3 ) (SEQ ID NO:8)   #16 5′-CTGCTCTAGAGCCTGCGGGCTGCGTCT-3′ (SEQ ID NO:6)       

     The DNA encoding Ala A21  Thr  B3  human insulin precursor was constructed in the same manner as described for the DNA encoding Ala A21  Asp B3  human insulin precursor in Example 1. The DNA sequence encoding the LaC212spx3 signal/leader/Ala A21  Thr B3  human insulin precursor complex and the amino acid sequence thereof are SEQ ID NOS. 23, 24 and 25. The plasmid pEA8.1.1 was shown to contain the desired sequence, transformed into  S. cerevisiae  strain MT663 as described in Example 1 and the resulting strain was named yEA005. 
     Example 3 
     Synthesis of Gly A21  Asp B3  Human Insulin Precursor from Yeast Strain yEA007 using the LaC212spx3 Signal/leader 
     The following oligonucleotides were synthesized:
         #98 5′-TGGCTAAGAGATTCGTTGACCAACACTTGTGCGGTTCTCACTTG GTTGAAGCTTTGTACTTGGTTTGTGGTGAAAGAGGTTTCTTCT ACACTCCAAAGTCTGACGACGCT-3′ (Asp B3 ) (SEQ ID NO:3)   #127 5′-CTGCGGGCTGCGTCTAACCACAGTAGTTCCAATTGGTACAA AGAACAGATAGAAGTACAACATTGTTCAACGATACCCT TAGCGTCGTCAGA-3′ (Gly A21 ) (SEQ ID NO:9)   #126 5′-GTCGCCATGGCTAAGAGATTCGTTG-3′ (Asp B3 ) (SEQ ID NO:5)   #16 5′-CTGCTCTAGAGCCTGCGGGCTGCGTCT-3′ (SEQ ID NO:6)       

     The DNA encoding Gly A21  Asp B3  human insulin precursor was constructed in the same manner as described for the DNA encoding Ala A21  Asp B3  human insulin precursor in Example 1. The DNA sequence encoding the LaC212spx3 signal/leader/Gly A21  Asp B3  human insulin precursor complex and the amino acid sequence thereof are SEQ ID NOS. 26, 27 and 28. The plasmid pEA1.5.6 was shown to contain the desired sequence, transformed into  S. cerevisiae  strain MT663 as described in Example 1 and the resulting strain was named yEA007. 
     Example 4 
     Synthesis of Gly A21  Thr B3  Human Insulin Precursor from Yeast Strain yEA006 using the LaC212spx3 Signal/leader 
     The following oligonucleotides were synthesized:
         #101 5′-TGGCTAAGAGATTCGTTACTCAACACTTGTGCGGTTCTCACTTGGTTGAAG CTTTGTACTTGGTTTGTGGTGAAAGAGGTTTCTTCTACACTCCAAAGTCTGACG ACGCT-3′ (Thr B3 ) (SEQ ID NO:7)   #127 5′-CTGCGGGCTGCGTCTAACCACAGTAGTTTTCCAATTGGTACAAAGAACAG ATAGAAGTACAACATTGTTCAACGATACCCTTAGCGTCGTCAGACTTTGG-3′ (Gly A21 ) (SEQ ID NO:9)   #15 5′-GTCGCCATGGCTAAGAGATTCGTTA-3′ (Thr B3 ) (SEQ ID NO:8)   #16 5′-CTGCTCTAGAGCCTGCGGGCTGCGTCT-3′ (SEQ ID NO:6)       

     The DNA encoding Gly A21  Thr B3  human insulin precursor was constructed in the same manner as described for the DNA encoding Ala A21  Asp B3  human insulin precursor in Example 1. The DNA sequence encoding the LaC212spx3 signal/leader/Gly A21  Thr B3  human insulin precursor complex and the amino acid sequence thereof are SEQ ID NOS. 29, 30 and 31. The plasmid pEA4.4.11 was shown to contain the desired DNA sequence, transformed into  S. cervisiae  strain MT663 as described in Example 1 and the resulting strain was named yEA006. 
     Example 5 
     Synthesis of Arg B-1  Arg B31  Single Chain Human Insulin Precursor having an N-terminal Extension (GluGluAlaGluAlaGluAlaArg) from Yeast Strain yEA113 using the Alpha Factor Leader 
     A) The Following Oligonucleotides were Synthesized: 
     
         
         
           
             #220 5′-ACGTACGTTCTAGAGCCTGCGGGCTGC-3′ (SEQ ID NO:10) 
             #263 5′-CACTTGGTTGAAGCTTTGTACTTGGTTTGTGGTGAAAGAGGTTTC TTCTACACTCCAAAGACTAGAGGTATCGTTGAA-3′ (SEQ ID NO:11) 
             #307 5′-GCTAACGTCGCCATGGCTAAGAGAGAAGAAGCTGAAGCTGAAGCT AGATTCGTTAACCAACAC-3′ (SEQ ID NO:12) 
           
         
       
    
     The following Polymerase Chain Reaction (PCR) was performed using the Gene Amp PCR reagent kit (Perkin Elmer, 761 Main Avewalk, Conn. 06859, USA) according to the manufacturer&#39;s instructions. In all cases, the PCR mixture was overlayed with 100 μl of mineral oil (Sigma Chemical Co, St. Louis, Mo., USA). The plasmid pAK220 (which is identical to pAK188) consists of a DNA sequence of 412 bp encoding the synthetic yeast signal/leader LaC212spx3 (described in Example 3 of WO 89/02463) followed by the insulin precursor MI5 (see SEQ ID NOS. 14, 15 and 16) inserted into the vector (phagemid) pBLUESCRIPT IIsk(+/−) (Stratagene, USA).
         5 μl of oligonucleotide #220 (100 pmol)   5 μl of oligonucleotide #263 (100 pmol)   10 μl of 10×PCR buffer   16 μl of dNTP mix   0.5μl of Taq enzyme   0.5μl of pAK220 plasmid (identical to pAK188) as template (0.2 μg of DNA)   63 μl of water       

     A total of 16 cycles were performed, each cycle comprising 1 minute at 95° C.; 1 minute at 40° C.; and 2 minutes at 72° C. The PCR mixture was then loaded onto a 2% agarose gel and subjected to electrophoresis using standard techniques. The resulting DNA fragment was cut out of the agarose gel and isolated using the Gene Clean kit (Bio 101 Inc., PO BOX 2284, La Jolla, Calif. 92038, USA) according to the manufacture&#39;s instructions. The purified PCR DNA fragment was dissolved in 10 μl of water and restriction endonuclease buffer and cut with the restriction endonucleases HindIII and XbaI according to standard techniques. The HindIII/XbaI DNA fragment was purified using The Gene Clean Kit as described. 
     The plasmid pAK406 consists of a DNA sequence of 520 bp comprising an EcoRI/HindIII fragment derived from pMT636 (described in WO 90/10075) encoding the yeast alpha factor leader and part of the insulin precursor ligated to the HindIII/XbaI fragment from pAK188 encoding the rest of the insulin precursor MI5 (see SEQ ID NOS. 32, 33 and 34) inserted into the vector cPOT. The vector pAK406 is shown in FIG.  2 . 
     The plasmid pAK233 consists of a DNA sequence of 412 bp encoding the synthetic yeast signal/leader LaC212spx3 (described in Example 3 of WO 89/02463) followed by the gene for the insulin precursor B(1-19)-GluLysArg-A(1-21) (A21-Gly) (see SEQ ID NOS. 35, 36 and 37) inserted into the vector cPOT. The plasmid pAK233 is shown in FIG.  2 . 
     The plasmid pAK233 was cut with the restriction endonucleases NcoI and XbaI and the vector fragment of 9273 bp isolated. The plasmid pAK406 was cut with the restriction endonucleases NcoI and HindIII and the vector fragment of 2012 bp isolated. These two DNA fragments were ligated together with the HindIII/XbaI PCR fragment using T4 DNA ligase and standard conditions. The ligation mixture was then transformed into a competent  E. coli  strain (R−, M+) followed by selection for ampicillin resistance. Plasmids were isolated from the resulting  E. coli  colonies using a standard DNA miniprep technique and checked with appropriate restriction endonucleases i.e. EcoRI, XbaI, NcoI, HindIII. The selected plasmid was shown by DNA sequencing analyses to contain the correct sequence for the Arg B31  single chain human insulin precursor DNA and to be inserted after the DNA encoding the  S. cervisiae  alpha factor DNA. The plasmid was named pEA108 and is shown in FIG.  2 . The DNA sequence encoding the alpha factor leader/Arg B31  single chain human insulin precursor complex and the amino acid sequence thereof are SEQ ID NOS. 38, 39 and 40. The plasmid pEA 108 was transformed into  S. cervisiae  strain MT663 as described in Example 1 and the resulting strain was named yEA108. 
     B) The following Polymerase Chain Reaction (PCR) was performed using the Gene Amp PCR reagent kit (Perkin Elmer, 761 Main Avewalk, Conn. 06859, USA) according to the manufacturer&#39;s instructions. In all cases, the PCR mixture was overlayed with 100 μl of mineral oil (Sigma Chemical Co., St. Louis, Mo., USA) 
     
         
         
           
             5 μl of oligonucleotide #220 (100 pmol) 
             5 μl of oligonucleotide #307 (100 pmol) 
             10 μl of 10×PCR buffer 
             16 μl of dNTP mix 
             0.5 μl of Taq enzyme 
             0.2 μl of pEA108 plasmid as template (0.1 ug DNA) 
             63 μl of water 
           
         
       
    
     A total of 16 cycles were performed, each cycle comprising 1 minute at 95° C.; 1 minute at 40° C.; and 2 minutes at 72° C. The PCR mixture was then loaded onto an 2% agarose gel and subjected to electrophoresis using standard techniques. The resulting DNA fragment was cut out of the agarose gel and isolated using the Gene Clean kit (Bio 101 Inc., PO BOX 2284, La Jolla, Calif. 92038, USA) according to the manufacture&#39;s instructions. The purified PCR DNA fragment was dissolved in 10 μl of water and restriction endonuclease buffer and cut with the restriction endonucleases NcoI and XbaI according to standard techniques. The NcoI/XbaI DNA fragment was purified using The Gene Clean Kit as described. 
     The plasmid pAK401 consists of a DNA sequence of 523 bp composed of an EcoRI/NcoI fragment derived from pMT636 (described in WO 90/10075) (constructed by by introducing a NcoI site in the 3′-end of the alpha leader by site directed mutagenesis) encoding the alpha factor leader followed by a NcoI/XbaI fragment from pAK188 encoding the insulin precursor MI5 (see SEQ ID NOS. 41, 42 and 43) inserted into the vector (phagemid) pBLUESCRIPT IIsk(+/−) (Stratagene, USA). The plasmid pAK401 is shown in FIG.  3 . 
     The plasmid pAK401 was cut with the restriction endonucleases NcoI and XbaI and the vector fragment of 3254 bp isolated and ligated together with the NcoI/XbaI PCR fragment. The ligation mixture was then transformed into a competent  E. coli  strain and plasmids were isolated from the resulting  E. coli  colonies using a standard DNA miniprep technique and checked with appropriate restriction endonucleases i.e. EcoRI, XbaI, NcoI. The selected plasmid, named p113A (shown in FIG.  3 ), was cut with EcoRI and XbaI and the fragment of 535 bp isolated. 
     The plasmid pAK233 was cut with the restriction endonucleases NcoI and XbaI, and with EcoRI/NcoI and the fragments of 9273 and 1644 bp isolated. These two DNA fragments were ligated together with the EcoRI/XbaI fragment from p113A using T4 DNA ligase and standard conditions. The ligation mixture was then transformed into a competent  E. coli  strain (R−, M+) followed by selection for ampicillin resistance. Plasmids were isolated from the resulting  E. coli  colonies using a standard DNA miniprep technique and checked with appropriate restriction endonucleases i.e. EcoRI, XbaI, NcoI, HindIII. The selected plasmid was shown by DNA sequencing analyses to contain the correct sequence for the Arg B31  single chain human insulin precursor DNA with the N-terminal extension GluGluAlaGluAlaGluAlaArg and to be inserted after the DNA encoding the  S. cerevisiae  alpha factor DNA. The plasmid was named pEA113 and is shown in FIG.  3 . The DNA sequence encoding the alpha factor leader/Arg B-1  Arg B31  single chain human insulin precursor having an N-terminal extension (GluGluAlaGluAlaGluAlaArg) and the amino acid sequence thereof are SEQ ID NOS. 44, 45 and 46. The plasmid pEA113 was transformed into  S. cervisiae  strain MT663 as described in Example 1 and the resulting strain was named yEA113. 
     Example 6 
     Synthesis of Arg B-1  Arg B31  Single Chain Human Insulin Precursor having an N-terminal Extension (GluGluAlaGluAlaGluAlaGluArg) from Yeast Strain yEA136 using the Alpha Factor Leader 
     The following oligonucleotide was synthesized:
         #389 5′-GCTAACGTCGCCATGGCTAAGAGAGAAGAAGCTGAAGCGAAGCTGAAAGATT CGTTAACCAACAC-3′ (SEQ ID NO:13)       

     The following PCR was performed using the Gene Amp PCR reagent kit 5 μl of oligonucleotide #220 (100 pmol) 5 μl of oligonucleotide #389 (100 pmol) 10 μl of 10×PCR buffer 16 μl of dNTP mix 0.5 μl of Taq enzyme 2 μl of pEA113 plasmid as template (0.5 ug DNA) 63 μl of water 
     A total of 12 cycles were performed, each cycle comprising 1 minute at 95° C.; 1 minute at 37° C.; and 2 minutes at 72° C. 
     The DNA encoding alpha factor leader/Arg B-1  Arg B31  single chain human insulin precursor having an N-terminal extension (GluGluAlaGluAlaGluAlaGluArg) was constructed in the same manner as described for the DNA encoding alpha factor leader/Arg B-1  Arg B31  single chain human insulin precursor having an N-terminal extension (GluGluAlaGluAlaGluAlaArg) in Example 5. The plasmid was named pEA136. The DNA sequence encoding the alpha factor leader/Arg B-1  Arg B31  single chain human insulin precursor having an N-terminal extension (GluGluAlaGluAlaGluAlaGluArg) and the amino acid sequence thereof are SEQ ID NOS. 47, 48 and 49. The plasmid pEA136 was transformed into  S. cerevisiae  strain MT663 as described in Example 1 and the resulting strain was named yEA136. 
     Example 7 
     Synthesis of (A1,B1)-diBoc Human Insulin 
     5 g of zinc-free human insulin was dissolved in 41.3 ml of DMSO. To the solution was added 3.090 ml of acetic acid. The reaction was conducted at room temperature and initiated by addition of 565 mg of di-tert-butyl pyrocarbonate dissolved in 5.650 ml of DMSO. The reaction was allowed to proceed for 5½ hour and then stopped by addition of 250 μl of ethanolamine. The product was precipitated by addition of 1500 ml of acetone. The precipitate was isolated by centrifugation and dried in vacuum. A yield of 6.85 g material was obtained. 
     (A1,B1)-diBoc insulin was purified by reversed phase HPLC as follows: The crude product was dissolved in 100 ml of 25% ethanol in water, adjusted to pH 3.0 with HCl and applied to a column (5 cm diameter, 30 cm high) packed with octadecyldimethylsilyl-substituted silica particles (mean particle size 15 μm, pore size 100 Å) and equilibrated with elution buffer. The elution was performed using mixtures of ethanol and 1 mM aqueous HCl, 0.3 M KCl at a flow of 2 l/h. The insulin was eluted by increasing the ethanol content from 30% to 45%. The appropriate fraction was diluted to 20% ethanol and precipitated at pH 4.8. The precipitated material was isolated by centrifugation and dried in vacuum. Thus 1.701 g of (A1,B1)-diBoc human insulin was obtained at a purity of 94.5%. 
     Example 8 
     Synthesis of (N εB29 -benzoyl Human Insulin) 6 , 3Zn 2+   
     400 mg of (A1,B1)-diBoc human insulin was dissolved in 2 ml of DMSO. To the solution was added 748 μl of a mixture of N-methylmorpholine and DMSO (1:9, v/v). The reaction was conducted at 15° C. and initiated by addition of 14.6 mg of benzoic acid N-hydroxysuccinimide ester dissolved in 132 μl DMF. The reaction was stopped after 2 hours by addition of 100 ml of acetone. The precipitated material was isolated by centrifugation and dried in vacuum. 343 mg of material was collected. 
     The Boc protecting groups were eliminated by addition of 4 ml of TFA. The dissolved material was incubated for 30 minutes and then precipitated by addition of 50 ml of acetone. The precipitate was isolated by centrifugation and dried in vacuum. 
     N εB29 -benzoyl human insulin was purified by reversed phase HPLC as described in Example 7. A yield of 230 mg was obtained. Recrystallization from 15% aqueous ethanol containing 6 mM Zn 2+  and 50 mM citrate at pH 5.5 gave crystals of the title compound which were isolated by centrifugation and dried in vacuum. The yield was 190 mg. 
     Molecular mass, found by MS: 5911, theory: 5911. 
     Example 9 
     Synthesis of (N εB29 -lithocholoyl Human Insulin) 6 , 3Zn 2+   
     400 mg of (A1,B1)-diBoc human insulin was dissolved in 2 ml of DMSO. To the solution was added 748 μl of a mixture of N-methylmorpholine and DMSO (1:9, v/v). The reaction was conducted at 15° C. and initiated by addition of 31.94 mg of lithocholic acid N-hydroxysuccinimide ester dissolved in 300 μl of DMF. The reaction was stopped after 2 hours by addition of 100 ml of acetone. The precipitated material was isolated by centrifugation and dried in vacuum. 331 mg of material was obtained. 
     The Boc protecting groups were eliminated by addition of 4 ml of TFA. The dissolved material was incubated for 30 minutes and then precipitated by addition of 50 ml of acetone. The precipitate was isolated by centrifugation and dried in vacuum. The yield was 376 mg. 
     B29-lithocholoyl insulin was purified by reversed phase HPLC as described in Example 7. A final yield of 67 mg was obtained at a purity of 94%. Recrystallization from 15% aqueous ethanol containing 6 mM Zn 2+  and 50 mM citrate at pH 5.5 gave crystals of the title compound which were isolated by centrifugation and dried in vacuum. The yield was 49 mg. 
     Molecular mass, found by MS: 6160, theory: 6166. 
     Example 10 
     Synthesis of (N εB29 -decanoyl Human Insulin) 6 , 3Zn 2+   
     400 mg of (A1,B1)-diBoc human insulin was dissolved in 2 ml of DMSO. To the solution was added 748 μl of a mixture of N-methylmorpholine and DMSO (1:9, v/v). The reaction was conducted at 15° C. and initiated by addition of 18.0 mg of decanoic acid N-hydroxysuccinimide ester dissolved in 132 μl of DMF. The reaction was stopped after 60 minutes and the product precipitated by addition of 100 ml of acetone. The precipitated material was isolated by centrifugation and dried in vacuum. 420 mg of intermediate product was collected. 
     The Boc protecting groups were eliminated by addition of 4 ml of TFA. The dissolved material was incubated for 30 minutes and the product was then precipitated by addition of 50 ml of acetone. The precipitate was isolated by centrifugation and dried in vacuum. The yield of crude product was 420 mg. 
     The crude product was purified by reversed phase HPLC as described in Example 7. A final yield of 254 mg of the title product was obtained. The purity was 96.1%. Recrystallization from 15% aqueous ethanol containing 6 mM Zn 2+  and 50 mM citrate at pH 5.5 gave crystals of the title compound which were isolated by centrifugation and dried in vacuum. The yield was 217 mg. 
     Molecular mass, found by MS: 5962, theory: 5962. 
     Example 11 
     Synthesis of des(B30) Human Insulin 
     Synthesis of des(B30) human insulin was carried out as described by Markussen (Methods in diabetes research, Vol. I, Laboratory methods, part B, 404-410. Ed: J. Lamer and S. Phol, John Wiley &amp; Sons, 1984). 5 g of human insulin was dissolved in 500 ml of water while the pH value of the solution was kept at 2.6 by addition of 0.5 M sulphuric acid. Subsequently, the insulin was salted out by addition of 100 g of ammonium sulphate and the precipitate was isolated by centrifugation. The pellet was dissolved in 800 ml of 0.1 M ammonium hydrogen carbonate and the pH value of the solution was adjusted to 8.4 with 1 M ammonia. 
     50 mg of bovine carboxypeptidase A was suspended in 25 ml of water and isolated by centrifugation. The crystals were suspended in 25 ml of water and 1 M ammonia was added until a clear solution was obtained at a final pH of 10. The carboxypeptidase solution was added to the insulin solution and the reaction was allowed to proceed for 24 hours. A few drops of toluene were added to act as preservative during the reaction. 
     After 24 hours the des(B30) human insulin was crystallized by successive addition of 80 g of sodium chloride while the solution was stirred. The pH value was then adjusted to 8.3 and the crystallization was allowed to proceed for 20 hours with gentle stirring. The crystals were isolated on a 1.2 μm filter, washed with 250 ml of ice cold 2-propanol and finally dried in vacuum. 
     Example 12 
     Synthesis of (A1,B1)-diBoc des(B30) Human Insulin 
     The title compound was synthesized by a method similar to that described in Example 7, using des(B30) porcine insulin as the starting material. The crude product was precipitated by acetone and dried in vacuum. The (A1,B1)-diBoc des(B30) human insulin was purified by reversed phase HPLC as described in Example 7. 
     Example 13 
     Synthesis of N εB29 -decanoyl des(B30) Human Insulin 
     400 mg of (A1,B1)-diBoc des(B30) human insulin was used as starting material for the synthesis of N εB29 -decanoyl des(330) human insulin, following the procedure described in Example 10. The crude product was precipitated by acetone, dried in vacuum and deprotected using TFA. The resulting product was precipitated by acetone and dried in vacuum. N εB29 -decanoyl des(B30) human insulin was then purified by reversed phase HPLC as described in Example 10. 
     Molecular mass, found by MS: 5856, theory: 5861. 
     Example 14 
     Synthesis of N εB29 -dodecanyl des(B30) Human Insulin 
     a. Immobilization of  A. lyticus  Protease 
     13 mg of  A. lyticus  protease, dissolved in 5 ml of aqueous 0.2 M NaHCO 3  buffer, pH 9.4, was mixed with 4 ml of settled MiniLeak® Medium gel, which had been washed with the same buffer (MiniLeak is a divinylsulfone activated Sepharose CL 6B, obtained from KemEnTec, Copenhagen). The gel was kept in suspension by gentle stirring for 24 hours at room temperature. Then, the gel was isolated by filtration, washed with water, and suspended in 20 ml of 1 M ethanolamine buffer, pH 9.4, and kept in suspension for 24 hours at room temperature. Finally, the gel was washed with water followed by 0.1 M acetic acid and stored at 4° C. The enzyme activity in the filtrate was 13% of that in the initial solution, indicating a yield in the immobilization reaction of about 87%. 
     b. Immobilization of Porcine Trypsin 
     Porcine trypsin was immobilized to MiniLeak® Low to a degree of substitution of 1 mg per ml of gel, using the conditions described above for immobilization of  A. lyticus.    
     c. Synthesis of Glu(GluAla) 3 Arg-B(1-29), ThrArg-A(1-21) Insulin using Immobilized  A. lyticus  Protease 
     To 200 mg of Glu(GluAla) 3 Arg-B(1-29)-ThrArg-A(1-21) single-chain human insulin precursor, dissolved in 20 ml of 0.1 M NaHCO 3  buffer, pH 9.0, was added 4 ml of the gel carrying the immobilized  A. lyticus  protease. After the gel had been kept in suspension in the reaction mixture for 6 hours at room temperature the hydrolysis was complete, rendering Glu(GluAla) 3 -Arg-B(1-29), ThrArg-A(1-21) human insulin (the reaction was followed by reversed phase HPLC). After the hydrolysis, the gel was removed by filtration. To the filtrate was added 5 ml of ethanol and 15 μL of 1 M ZnCl 2  and the pH was adjusted to 5.0 using HCl. The precipitation of the product was completed on standing overnight at 4° C. with gentle stirring. The product was isolated by centrifugation. After one washing with 1 ml of ice cold 20% ethanol and drying in vacuo the yield was 190 mg. 
     d. Synthesis of N αA1 ,N αB1 ,N εB29 -tridodecanoyl Glu(GluAla) 3 Arg-B(1-29), Thr-Arg-A(1-21) Human Insulin using Dodecanoic Acid N-hydroxysuccinimide Ester 
     190 mg (30 μmol) of Glu(GluAla) 3 Arg-B(1-29), ThrArg-A(1-21) insulin was dissolved in 1 ml of DMSO and 1.05 ml of a 0.572 M solution of N,N-diisopropylethylamine in DMF. The solution was cooled to 15° C. and 36 mg (120 μmol) of dodecanoic acid N-hydroxysuccinimide ester dissolved in 0.6 ml of DMSO was added. The reaction was completed within 24 hours. The lipophilic title compound was not isolated. 
     e. Synthesis of N εB29 -dodecanoyl des(B30) Insulin 
     The product from the previous step, d., contained in approximately 2,65 ml of DMSO/DMF/N,N-diisopropylethylamine was diluted with 10.6 ml of a 50 mM glycine buffer comprising 20% ethanol and the pH adjusted to 10 with NaOH. After standing for 1 hour at room temperature 1 ml of MiniLeak gel, carrying 1 mg of immobilized trypsin per 30 ml of gel, was added. The reaction mixture was stirred gently for 48 hours at room temperature. In order to isolate the desired product, the reaction mixture was applied to a reversed phase HPLC column (5 cm in diameter, 30 cm high), packed with octadecyldimethylsilyl-substituted silica particles (mean particle size 15 μm, pore size 100 Å). For the elution was used 20 mM Tris/HCl buffers, adjusted to pH 7.7 and comprising an increasing concentration of ethanol, from 40% to 44% (v/v), at a rate of 2000 ml/h. The major peak eluting at about 43-44% of ethanol contained the title compound. The fractions containing the major peak were pooled, water was added to reduce the ethanol concentration to 20% (v/v), and the pH was adjusted to 5.5. The solution was left overnight at −20° C., whereby the product precipitated. The precipitate was isolated by centrifugation at −8° C. and dried in vacuo, The yield of the title compound was 90 mg. 
     Molecular mass, found by MS: 5892, theory: 5890. 
     Example 15 
     Synthesis of N εB29 -(N-myristoyl-α-glutamyl) Human Insulin 
     500 mg of (A1,B1)-diBoc human insulin was dissolved in 2.5 ml of DMSO and 428 μl of ethyl deisopropylamine, diluted with 2.5 ml of DMSO/DMF 1/1 (v/v), was added. The temperature was adjusted to 15° C. and 85 mg of N-myristoyl-Glu(OBut) N-hydroxysuccinimide ester, dissolved in 2.5 ml of DMSO/DMF 1/1 (v/v), was added. After 30 min the reaction mixture was poured into 60 ml of water, the pH adjusted to 5 and the precipitate isolated by centrifugation. The precipitate was dried in vacuo. The dried reaction mixture was dissolved in 25 ml of TFA, and the solution was left for 30 min at room temperature. The TFA was removed by evaporation in vacuo. The gelatinous residue was dissolved in 60 ml of water and the pH was adjusted to 11.2 using concentrated ammonia. The title compound was crystallized from this solution by adjustment of the pH to 8.5 using 6 N HCl. The product was isolated by centrifugation, washed once by 10 ml of water, and dried in vacuo. Yield 356 mg. Purity by HPLC 94%. 
     The product of this example is thus human insulin wherein the ε-amino group of Lys B29  has a substituent of the following structure: CH 3 (CH 2 ) 12 CONHCH(CH 2 CH 2 COOH)CO—. 
     Molecular mass, found by MS: 6146, theory: 6148. 
     Example 16 
     Synthesis of N εB29 -undecanoyl des(B30) Human Insulin 
     The title compound was synthesized analogously to N εB29 -dodecanoyl des(B30) human insulin as described in Example 14, by using undecanoic acid N-hydroxysuccinimide ester instead of dodecanoic acid N-hydroxysuccinimide ester. 
     Molecular mass of the product found by MS: 5876, theory: 5876. 
     Example 17 
     Synthesis of N εB29 -tridecanoyl des(B30) Human Insulin 
     The title compound was synthesized analogously to N εB29 -dodecanoyl des(B30) human insulin as described in Example 14, by using tridecanoic acid N-hydroxysuccinimide ester instead of dodecanoic acid N-hydroxysuccinimide ester. 
     Molecular mass of the product found by MS: 5899, theory: 5904. 
     Example 18 
     Synthesis of N εB29 -myristoyl des(B30) Human Insulin 
     The title compound was synthesized analogously to N εB29 -dodecanoyl des(B30) human insulin as described in Example 14, by using myristic acid N-hydroxysuccinimide ester instead of dodecanoic acid N-hydroxysuccinimide ester. 
     Molecular mass of the product found by MS: 5923, theory: 5918. 
     Example 19 
     Synthesis of N εB29 -palmitoyl des(B30) Human Insulin 
     The title compound was synthesized analogously to N εB29 -dodecanoyl des(B30) human insulin as described in Example 14, by using palmitic acid N-hydroxysuccinimide ester instead of dodecanoic acid N-hydroxysuccinimide ester. 
     Molecular mass of the product found by MS: 5944, theory: 5946. 
     Example 20 
     Synthesis of N εB29 -suberoyl-D-thyroxine Human Insulin 
     a. Preparation of N-(succinimidylsuberoyl)-D-thyroxine. 
     Disuccinimidyl suberate (1.0 g, Pierce) was dissolved in DMF (50 ml), and D-thyroxine (2.0 g, Aldrich) was added with stirring at 20° C. The thyroxine slowly dissolved, and after 20 hours the solvent was removed by evaporation in vacuo. The oily residue was crystallized from 2-propanol to yield 0.6 g of N-(succinimidylsuberoyl)-D-thyroxine, m.p. 128-133° C. 
     b. Reaction of (A1,B1)-diBoc Human Insulin with N-(succinimidylsuberoyl)-D-thyroxine. 
     (A1,B1)-diBoc human insulin (200 mg) was dissolved in dry DMF (10 ml) by addition of triethylamine (20 μl) at room temperature. Then, N-(succinimidylsuberoyl)-D-thyroxine (80 mg) was added. The reaction was monitored by reversed phase HPLC and when the reaction was about 90% complete, the solvent was removed in vacuo. To the evaporation residue, anhydrous trifluoroacetic acid (5 ml) was added, and the solution was kept for 1 hour at room temperature. After removal of the trifluoroacetic acid in vacuo, the residue was dissolved in a mixture of 1M acetic acid (5 ml) and acetonitrile (1.5 ml), purified by preparative reversed phase HPLC and desalted on a PD-10 column. The yield of N εB29 -suberoyl-D-thyroxine human insulin was 50 mg. 
     The product of this example is thus human insulin wherein the ε-amino group of Lys B29  has a substituent of the following structure: Thyrox-CO(CH 2 ) 6 CO—, wherein Thyrox is thyroxine which is bound to the octanedioic acid moiety via an amide bond to its α-amino group. 
     Molecular mass of the product found by MS: 6724, theory: 6723. 
     Example 21 
     Synthesis of N εB29 -(2-succinylamido)myristic Acid Human Insulin 
     a. Preparation of α-aminomyristic Acid Methyl Ester,HCl. 
     To methanol (5 ml, Merck) at −10° C., thionyl chloride (0.2 ml, Aldrich) was added dropwise while stirring vigorously. Then, α-aminomyristic acid (0.7 g, prepared from the α-bromo acid by reaction with ammonia) was added. The reaction mixture was stirred at room temperature overnight, and then evaporated to dryness. The crude product (0.7 g) was used directly in step b. 
     b. Preparation of N-succinoyl-α-aminomyristic Acid Methyl Ester. 
     α-Aminomyristic acid methyl ester,HCl (0.7 g) was dissolved in chloroform (25 ml, Merck). Triethylamine (0.35 ml, Fluka) was added, followed by succinic anhydride (0.3 g, Fluka). The reaction mixture was stirred at room temperature for 2 hours, concentrated to dryness, and the residue recrystallized from ethyl acetate/petroleum ether (1/1). Yield: 0.8 g. 
     c. Preparation of N-(succinimidylsuccinoyl)-α-aminomyristic Acid Methyl Ester. 
     N-succinoyl-α-aminomyristic acid methyl ester (0.8 g) was dissolved in dry DMF (10 ml, Merck, dried over 4 Å molecular sieve). Dry pyridine (80 μl, Merck), and di(N-succinimidyl)carbonate (1.8 g, Fluka) were added, and the reaction mixture was stirred overnight at room temperature. The evaporation residue was purified by flash chromatography on silica gel 60 (Merck), and recrystallized from 2-propanol/petroleum ether (1/1). Yield of N-(succinimidylsuccinoyl)-α-aminomyristic acid methyl ester: 0.13 g, m.p. 64-66° C. 
     d. Reaction of (A1,B1)-diBoc Human Insulin with N-(succinimidylsuccinoyl)-α-aminomyristic Acid Methyl Ester. 
     The reaction was carried out as in Example 20 b., but using N-(succinimidylsuccinoyl)-α-aminomyristic acid methyl ester (16 mg) instead of N-(succinimidylsuberoyl)-D-thyroxine. After removal of the trifluoroacetic acid in vacuo, the evaporation residue was treated with 0.1M sodium hydroxide at 0° C. to saponify the methyl ester. When the saponification was judged to be complete by reversed phase HPLC, the pH value in the solution was adjusted to 3, and the solution was lyophilized. After purification by preparative reversed phase HPLC and desalting on a PD-10 column, the yield of N εB29 -(2-succinylamido)myristic acid human insulin was 39 mg. 
     The product of this example is thus human insulin wherein the ε-amino group of Lys B29  has a substituent of the following structure: CH 3 (CH 2 ) 11 CH(COOH)NHCOCH 2 CH 2 CO—. 
     Molecular mass of the product found by MS: 6130, theory: 6133. 
     Example 22 
     Synthesis of N εB29 -octyloxycarbonyl Human Insulin 
     The synthesis was carried out as in Example 20 b., but using n-octyloxycarbonyl N-hydroxysuccinimide (9 mg, prepared from n-octyl chloroformate (Aldrich) and N-hydroxysucciniimide), instead of N-(succinimidylsuberoyl)-D-thyroxine. The yield of N εB29 -octyloxycarbonyl human insulin was 86 mg. 
     The product of this example is thus human insulin wherein the ε-amino group of Lys B29  has a substituent of the following structure: CH 3 (CH 2 ) 7 OCO—. 
     Molecular mass of the product found by MS: 5960, theory: 5964. 
     Example 23 
     Synthesis of N εB29 -(2-succinylamido)palmitic Acid Human Insulin 
     a. Preparation of N-(succinimidylsuccinoyl)-α-amino Palmitic Acid Methyl Ester. 
     This compound was prepared as described in Example 21 a.-c., using α-amino palmitic acid instead of α-amino myristic acid. 
     b. Reaction of (A1,B1)-diBoc Human Insulin with N-(succinimidylsuccinoyl)-α-aminopalmitictic Acid Methyl Ester. 
     The reaction was carried out as in Example 21 d., but using N-(succinimidylsuccinoyl)-α-aminopalmitic acid methyl ester instead of N-(succinimidylsuccinoyl)-α-aminopalmitic acid methyl ester to give N εB29 -(2 succinylamido)palmitic acid human insulin. 
     The product of this example is thus human insulin wherein the ε-amino group of Lys B29  has a substituent of the following structure: CH 3 (CH 2 ) 13 CH(COOH)NHCOCH 2 CH 2 CO—. 
     Example 24 
     Synthesis of N εB29 -(2-succinylamidoethyloxy)palmitic Acid Human Insulin 
     a. Preparation of N-(succinimidylsuccinoyl)-2-aminoethyloxy Palmitic Acid Methyl Ester. 
     This compound was prepared as described in Example 21 a.-c. but using 2-aminoethyloxy palmitic acid (synthesized by the general procedure described by R. TenBrink,  J. Org. Chem . 52 (1987) 418-422 instead of α-amino myristic acid. 
     b. Reaction of (A1,B1)-diBoc human insulin with N-(succinimidylsuccinoyl)-2-aminoethyloxypalmitictic Acid Methyl Ester. 
     The reaction was carried out as in Example 21 d., but using N-(succinimidylsuccinoyl)-2-aminoethyloxypalmitic acid methyl ester instead of N-(succinimidylsuccinoyl)-ε-aminomyristic acid methyl ester to give N εB29 -(2-succinylamidoethyloxy)palmitic Acid Human Insulin. 
     The product of this example is thus human insulin wherein the ε-amino group of Lys B29  has a substituent of the following structure: CH 3 (CH 2 ) 13 CH(COOH)NHCH 2 CH 2 OCOCH 2 CH 2 CO—. 
     Example 25 
     Synthesis of N εB29 -lithocholoyl-α-glutamyl des(B30) Human Insulin 
     The synthesis was carried out as in Example 13 using N-lithocholoyl-L-glutamic acid α-N-hydroxysuccinimide ester, γ-tert-butyl ester instead of decanoic acid N-hydroxysuccinimide ester. 
     The product of this example is thus des(B30) human insulin wherein the ε-amino group of Lys B29  has a substituent of the following structure: lithocholoyl-NHCH(CH 2 CH 2 COOH)CO—. 
     Molecular mass of the product found by MS: 6194, theory: 6193. 
     Example 26 
     Synthesis of N εB29 -3,3′,5,5′-tetraiodothyroacetyl Human Insulin 
     The synthesis was carried out as in Example 10 using 3,3′,5,5′-tetraiodothyroacetic acid N-hydroxysuccinimide ester, instead of decanoic acid N-hydroxysuccinimide ester. 
     Molecular mass of the product found by MS: 6536, theory: 6538. 
     Example 27 
     Synthesis of N εB29 -L-thyroxyl Human Insulin 
     The synthesis was carried out as in Example 10 using Boc-L-thyroxine N-hydroxysuccinimide ester, instead of decanoic acid N-hydroxysuccinimide ester. 
     Molecular mass of the product found by MS: 6572, theory: 6567. 
     Example 28 
     A Pharmaceutical Composition Comprising 600 nmol/ml of N εB29 -decanoyl des(B30) Human Insulin, ⅓Zn 2+  in Solution 
     N εB29 -decanoyl des(B30) human insulin (1.2 μmol) was dissolved in water (0.8 ml) and the pH value was adjusted to 7.5 by addition of 0.2 M sodium hydroxide. 0.01 M zinc acetate (60 μl) and a solution containing 0.75% of phenol and 4% of glycerol (0.8 ml) was added. The pH value of the solution was adjusted to 7.5 using 0.2 M sodium hydroxide and the volume of the solution was adjusted to 2 ml with water. 
     The resulting solution was sterilized by filtration and transferred aseptically to a cartridge or a vial. 
     Example 29 
     A Pharmaceutical Composition Comprising 600 nmol/ml of N εB29 -decanoyl Human Insulin, ½Zn 2+  in Solution 
     1.2 μmol of the title compound was dissolved in water (0.8 ml) and the pH value was adjusted to 7.5 by addition of 0.2 M sodium hydroxide. A solution containing 0.75% of phenol and 1.75% of sodium chloride (0.8 ml) was added. The pH value of the solution was adjusted to 7.5 using 0.2 M sodium hydroxide and the volume of the solution was adjusted to 2 ml with water. 
     The resulting solution was sterilized by filtration and transferred aseptically to a cartridge or a vial. 
     Example 30 
     A Pharmaceutical Composition Comprising 600 nmol/ml of N εB29 -lithocholoyl Human Insulin in Solution 
     1.2 μmol of the title compound was suspended in water (0.8 ml) and dissolved by adjusting the pH value of the solution to 8.5 using 0.2 M sodium hydroxide. To the solution was then added 0.8 ml of a stock solution containing 0.75% cresol and 4% glycerol in water. Finally, the pH value was again adjusted to 8.5 and the volume of the solution was adjusted to 2 ml with water. 
     The resulting solution was sterilized by filtration and transferred aseptically to a cartridge or a vial. 
     Example 31 
     A Pharmaceutical Composition Comprising a Solution of 600 nmol/ml of N εB29 -hexadecanoyl Human Insulin, ⅓ Zinc Ion per Insulin Monomer, 16 mM m-cresol, 16 mM Phenol, 1.6% Glycerol, 10 mM Sodium Chloride and 7 mM Sodium Phosphate 
     1.2 μmol of N εB29 -hexadecanoyl human insulin was dissolved in water (0.5 ml) by addition of 0.2 M sodium hydroxide to pH 8.0 and 40 μl of 0.01 M zinc acetate was added. To the solution was further added 100 μl of 0.32 M phenol, 200 μl of 0.16 M m-cresol, 800 μl of 4% glycerol, 33.3 μl of 0.6 M sodium chloride, and 140 μl of 0.1 M sodium phosphate (pH 7.5). The pH value of the solution was adjusted to 7.5 with 0.1 M hydrochloric acid and the volume adjusted to 2 ml with water. 
     Example 32 
     Solubility of Various Compositions Comprising N εB29 -tetradecanoyl des(B30) Human Insulin and N εB29 -hexadecanoyl Human Insulin 
     The solubility of N εB29 -tetradecanoyl des(B30) human insulin and N εB29 -hexadecanoyl human insulin in different compositions was tested. The compositions were prepared as described in Example 31 with the necessary adjustment of the amount of the components. Zinc acetate was either left out or an amount corresponding to ⅓ Zn 2+  per insulin monomer was used. Sodium chloride was used in amounts which resulted in a final concentration of 5, 25, 50, 75, 100 or 150 mM of sodium chloride. Zinc-free insulin was added to give a final amount in the composition of 1000 nmol/ml. In some cases a precipitate formed. The resulting solutions and suspensions were kept at 4° C. for a week and the concentration of insulin in solution in each composition was then measured by high performance size exclusion chromatography relative to a standard of human insulin (column: Waters ProteinPak 250×8 mm; eluent: 2.5 M acetic acid, 4 mM arginine, 20% acetonitrile; flow rate: 1 ml/min; injection volume: 40 μl; detection: UV absorbance at 276 nm). The results, in nmol/ml, are given in the table below: 
     
       
         
               
               
             
               
               
               
               
               
               
               
             
           
               
                   
               
               
                 Solubility of insulins (nmol/ 
                   
               
               
                 ml) in 16 mM phenol, 16 mM 
               
               
                 m-cresol, 1.6% glycerol, 7 
               
               
                 mM sodium phosphate, and 
               
               
                 pH 7.5, varying zinc 
                 Sodium chloride 
               
             
          
           
               
                 acetate and sodium chloride 
                 5 
                 25 
                 50 
                 75 
                 100 
                 150 
               
               
                 (mM) concentrations at 4° C. 
                 mM 
                 mM 
                 mM 
                 mM 
                 mM 
                 mM 
               
               
                   
               
               
                 N εB29 -tetradecanoyl des(B30) 
                  82 
                  115 
                  54 
                  77 
                  74 
                  84 
               
               
                 human insulin, zinc-free. 
               
               
                 N εB29 -tetradecanoyl des(B30) 
                 &gt;950 
                 &gt;950 
                 &gt;950 
                 &gt;950 
                 &gt;950 
                 485 
               
               
                 human insulin, ⅓ Zn 2+  per 
               
               
                 insulin monomer. 
               
               
                 N εB29 -hexadecanoyl human 
                 &gt;890 
                 &gt;950 
                  283 
                  106 
                 45 
                  29 
               
               
                 insulin, zinc-free. 
               
               
                 N εB29 -hexadecanoyl human 
                 &gt;950 
                 &gt;950 
                 &gt;950 
                 &gt;950 
                 920 
                 620 
               
               
                 insulin, ⅓ Zn 2+  per 
               
               
                 insulin monomer. 
               
               
                   
               
             
          
         
       
     
     In conclusion it appears that the solubility of the acylated insulins is increased by the addition of zinc. This is contrary to published data on human, porcine and bovine insulin (J Brange: Galenics of Insulin, page 19, Springer Verlag (1987); J Markussen et al.  Protein Engineering  1 (1987) 205-213). 
     Example 33 
     Preparative Crystallization of Zinc-free N εB29 -tetradecanoyl des(B30) Human Insulin 
     10 g of N εB29 -tetradecanoyl des(B30) human insulin was dissolved in 120 ml of 0.02 M NH 4 Cl buffer adjusted to pH 9.0 with NH 3  in ethanol/water (1:4, v/v). Gentle stirring was maintained throughout the crystallization. Crystallization was initiated at 23° C. by addition of 20 ml of 2.5 M NaCl dissolved in ethanol/water (1:4, v/v). A slight turbidity appeared in the solution. Further, 20 ml of 2.5 M sodium chloride dissolved in ethanol/water (1:4, v/v) was added at a constant rate of 5 ml/h, which caused the crystallization to proceed slowly. In order to decrease the solubility of the insulin, the pH value was then adjusted to 7.5 using 1 N hydrochloric acid. Finally, the temperature was lowered to 4° C. and the stirring continued overnight. The crystals were collected by filtration, washed twice with 25 ml of 0.2 M NaCl in ethanol/water (1:4, v/v), sucked dry and lyophilized. 
     The weight of the wet filter cake was 19.33 g. 
     The weight of lyophilized filter cake was 9.71 g. 
     Example 34 
     Synthesis of Lys B29 (N ε -[N α -tetradecanoyl-Glu-Gly-]) des(B30) Human Insulin 
     500 mg of (A1,B1)-diBoc human insulin was dissolved in a mixture of 186 μl of 4-methylmorpholine and 3814 μl of DMSO. The reaction was initiated by addition of 144 mg of tetradecanoyl-Glu(γ-OtBu)-Gly-OSu dissolved in 1000 μl of DMF. The reaction conducted at 15° C. and it was stopped after 4.5 hours by addition of 100 ml of acetone. The reaction product precipitated by addition of a few drops of concentrated HCl was subsequently isolated by centrifugation. The precipitate was then suspended in 100 ml of acetone, isolated by centrifugation and dried in vacuum. 637 mg of material was obtained. 
     The Boc protecting groups were eliminated by addition of 5 ml of TFA. The dissolved material was incubated for 30 minutes and then precipitated by addition of 100 ml of acetone and a few drops of concentrated HCl. The precipitate was then suspended in 100 ml acetone and isolated by centrifugation. The precipitated material was dissolved in 200 ml of 25% ethanol at pH 8 by addition of NH 4 OH and purified by reversed phase HPLC. The dissolved material was applied to a column (5 cm diameter, 30 cm high) packed with octadecyldimethylsilyl-substituted silica particles (mean particle size 15 μm, pore size 100 Å) and equilibrated with 0.02 M Bis-Tris, 30% ethanol adjusted to pH 7.3 with hydrochloric acid at a temperature of 40° C. The elution was performed using mixtures of 70% ethanol in water and Bis-Tris buffer. The flow was 2 l/h. The insulin was eluted by increasing the ethanol content from 30% to 50% and the effluent was monitored by its UV absorbance at 280 nm. The appropriate fraction was diluted to 20% ethanol adjusted to pH 4.5 and frozen at −20° C. The precipitated material was isolated after equilibration of the sample at 1° C. and subsequent centrifugation at the same temperature. The precipitate was dried in vacuum. Thus 292 mg of the title compound was obtained at a purity of 95.5%. 
     Molecular mass, found by MS: 6102.6, theory: 6103. 
     The lipophilicity of the title compound, relative to human insulin, k′ rel =20. The determination was carried out as described on page 23 of the description. 
     The disappearance half-life, T 50% , of the title compound after subcutaneous injection in pigs was found to be 11.9 hours. The determination was carried out as described on page 24 of the description using a composition similar to those described in Table 2 on page 26 of the description. 
     Example 35 
     Synthesis of Lys B29 (N ε -tetradecanoyl-Glu-) des(B30) Human Insulin 
     500 mg of (A1,B1)-diBoc human insulin was dissolved in a mixture of 186 μl of 4-methylmorpholine and 3814 μl of DMSO. The reaction was initiated by addition of 85 mg of N α -tetradecanoyl-Glu(OtBu)-OSu dissolved in 1000 μl of DMF. The reaction was conducted at 15° C. and it was stopped after 4.5 hours. The remaining process steps were performed as described in Example 34. The intermediate product was isolated and the protection groups were removed by TFA before purification by RP-HPLC and final isolation by precipitation and vacuum drying. 
     Thus 356 mg of the title compound was obtained at a purity of 94.1%. Molecular mass, found by MS: 6053±6, theory: 6046. 
     The lipophilicity of the title compound, relative to human insulin, k′ rel =24. The determination was carried out as described on page 23 of the description. 
     The disappearance half-life, T 50% , of the title compound after subcutaneous injection in pigs was found to be 8.8 hours. The determination was carried out as described on page 24 of the description using a composition similar to those described in Table 2 on page 26 of the description. 
     Example 36 
     Synthesis of Lys B29 (N ε -[N α -tetradecanoyl-Glu(−)-OH]) Human Insulin 
     400 mg of (A1,B1)-diBoc human insulin was dissolved in a mixture of 232 μl of ethyldiisopropylamine, 1880 μl of DMSO and 2088 μl of 1-methyl-2-pyrrolidone. The reaction was initiated by addition of 138 mg of N α -tetradecanoyl-Glu(OSu)-OtBu dissolved in 800 μl of 1-methyl-2-pyrrolidone. The reaction was conducted at 15° C. and it was stopped after 4.5 hours. The remaining process steps were performed as described in Example 34. The protection groups were removed from the intermediate product by TFA before purification by RP-HPLC and final isolation by precipitation and vacuum drying. 
     Thus 222 mg of the title compound was obtained at a purity of 95.5%. Molecular mass, found by MS: 6150±6, theory: 6147. 
     The lipophilicity of the title compound, relative to human insulin, k′ rel =21. The determination was carried out as described on page 23 of the description. 
     The disappearance half-life, T 50% , of the title compound after subcutaneous injection is in pigs was found to be 8.0 hours. The determination was carried out as described on page 24 of the description using a composition similar to the one described in the present Example 31. 
     Example 37 
     Synthesis of Lys B29 (N ε -[N α -hexadecanoyl-Glu(−)-OH]) Human Insulin 
     400 mg of (A1,B1)-diBoc human insulin was dissolved in a mixture of 232 μl of ethyldiisopropylamine, 880 μl of DMSO and 2088 μl of 1-methyl-2-pyrrolidone. The reaction was initiated by addition of 73 mg of N-hexadecanoyl-Glu(OSu)-OtBu dissolved in 800 μl of DMF. The reaction was conducted at 15° C. and it was stopped after 4.5 hours. The remaining process steps were performed as described in Example 34. 476 mg of intermediate product was obtained. The protection groups were removed from the intermediate product by TFA before purification by RP-HPLC and final isolation by precipitation and vacuum drying. 
     Thus 222 mg of the title compound was obtained at a purity of 81.2%. Molecular mass, found by MS: 6179±6, theory: 6175. 
     The lipophilicity of the title compound, relative to human insulin, k′ rel =67. The determination was carried out as described on page 23 of the description. 
     The disappearance half-life, T 50% , of the title compound after subcutaneous injection in pigs was found to be 13.0 hours. The determination was carried out as described on page 24 of the description using a composition similar to the one described in the present Example 31. 
     Example 38 
     Synthesis of Lys B29 (N ε -[N α -octadecanoyl-Glu(−)-OH]) des(B30) Human Insulin 
     400 mg of (A1,B1)-diBoc des(B30) human insulin was dissolved in a mixture of 232 μl of ethyldiisopropylamine, 3000 μl of DMSO and 268 μl of dimetylformamide. The reaction was initiated by addition of 114 mg N α -octadecanoyl-Glu(OSu)-OtBu dissolved in 500 μl of DNF. The reaction was conducted at 15° C. and it was stopped after 4.5 hours. The remaining process steps were performed as described in Example 34. 420 mg of intermediate product was obtained. The protection groups were removed from the intermediate product by TFA before purification by RP-HPLC and final isolation by precipitation and vacuum drying. 
     Thus 169 mg of the title compound was obtained at a purity of 98.3%. Molecular mass, found by MS: 6103±5, theory: 6102. 
     The lipophilicity of the title compound, relative to human insulin, k′ rel =185. The determination was carried out as described on page 23 of the description. 
     The disappearance half-life, T 50% , of the title compound after subcutaneous injection in pigs was found to be 9.7 hours. The determination was carried out as described on page 24 of the description using a composition similar to the one described in the present Example 31. 
     Example 39 
     Synthesis of Lys B29 (N ε-[N   α -tetradecanoyl-Glu(−)-OH]) des(B30) Human Insulin 
     400 mg of (A1,B1)-diBoc des(B30) human insulin was dissolved in a mixture of 232 μl of ethyldiisopropylamine and 3000 μl of DMSO. The reaction was initiated by addition of 138 mg of N α -tetradecanoyl-Glu(OSu)-OtBu dissolved in 768 μl of DMF. The reaction was conducted at 15° C. and it was stopped after 4.5 hours. The remaining process steps were performed as described in Example 34. 505 mg of intermediate product was obtained. The protection groups of the intermediate product were removed by TFA before purification by RP-HPLC and final isolation by precipitation and vacuum drying. 
     Thus 237 mg of the title compound was obtained at a purity of 96.7%. Molecular mass, found by MS: 6053±6, theory: 6046. 
     The lipophilicity of the title compound, relative to human insulin, k′ rel =21. The determination was carried out as described on page 23 of the description. 
     The disappearance half-life, T 50% , of the title compound after subcutaneous injection in pigs was found to be 12.8 hours. The determination was carried out as described on page 24 of the description using a composition similar to the one described in the present Example 31. 
     Example 40 
     Synthesis of Lys B29 (N ε -[N α -hexadecanoyl-Glu(−)-OH]) des(B30) Human Insulin 
     400 mg of (A1,B1)-diBoc des(B30) human insulin was dissolved in a mixture of 232 μl of ethyldiisopropylamine, 3000 μl of DMSO and 400 μl of dimetylformamide. The reaction was initiated by addition of 73 mg of N α -hexadecanoyl-Glu(OSu)-OtBu dissolved in 400 μl of DMF. The reaction was conducted at 15° C. and it was stopped after 4.5 hours. The remaining process steps were performed as described in Example 34. The protection groups of the intermediate product were removed by TFA before purification by RP-HPLC and final if isolation by precipitation and vacuum drying. 
     Thus 153 mg of the title compound was obtained at a purity of 95.2%. Molecular Mass, found by MS: 6073±6, theory: 6074. 
     The lipophilicity of the title compound, relative to human insulin, k′ rel =67. The determination was carried out as described on page 23 of the description. 
     The disappearance half-life, T 50% , of the title compound after subcutaneous injection in pigs was found to be 18.0 hours. The determination was carried out as described on page 24 of the description using a composition similar to the one described in the present Example 31. 
     Example 41 
     Synthesis of Lys B29 (N ε -[N α -lithocholyl-Glu(−)-OH]) des(B30) Human Insulin 
     400 mg of (A1,B1)-diBoc des(B30) human insulin was dissolved in a mixture of 148 μl 4-methylmorpholine and 3452 μl of DMSO. The reaction was initiated by addition of 132 mg of N α -lithocholoyl-Glu(OSu)-OtBu dissolved in 400 μl of DMF. The reaction was conducted at 15° C. and it was stopped after 4.5 hours. The remaining process steps were performed as described in Example 34. 493 mg of intermediate product was obtained. The protection groups of the intermediate product were removed by TFA before purification by RP-HPLC and final isolation by precipitation and vacuum drying. 
     Thus 209 mg of the title compound was obtained at a purity of 97.4%. Molecular Mass, found by MS: 6185±10, theory: 6194. 
     Example 42 
     Lys B29 (N ε -[N α -tetradecanoyl Aad(−)-OH]) des(B30) Human Insulin 
     Aad is 5-aminohexadioic acid. 347 mg of (A1,B1)-diBoc des(B30) human insulin was dissolved in a mixture of 129 μl of 4-methylmorpholine and 2645 μl of DMSO. The reaction was initiated by addition of 58 mg of N α -tetradecanoyl-Aad(OSu)-OtBu dissolved in 694 μl of DMF. The activated ester was prepared in analogy with chemistry well-known from as aspartic acid derivatisation (L. Benoiton: Can.J.Chem.40,570-72,1962, R.Roeske: J.Org.Chem 28 1251-93 (1963)). The reaction was conducted at 15° C. and it was stopped after 4.5 hours. The remaining process steps were performed as described in Example 34. The protection groups of the intermediate product were removed by TFA before purification by RP-HPLC and final isolation by precipitation and vacuum drying. 
     Thus 149 mg of the title compound was obtained at a purity of 97.9%. Molecular Mass, found by MS: 6061±2, theory: 6060. 
     The lipophilicity of the title compound, relative to human insulin, k′ rel =21. The determination was carried out as described on page 23 of the description. 
     The disappearance half-life, T 50% , of the title compound after subcutaneous injection in pigs was found to be 16.1 hours. The determination was carried out as described on page 24 of the description using a composition similar to the one described in the present Example 31. 
     Example 43 
     Synthesis of Lys B29 (N ε -[N α -tetradecanoyl-γ-carboxy-Glu-]) des(B30) Human Insulin 
     400 mg of (A1,B1)-diBoc des(B30) human insulin was dissolved in a mixture of 190 μl of triethylamine and 3000 μl of DMSO. The reaction was initiated by addition of 83 mg of γ-carboxy Glu N-tetradecansyre γ,γ′-di(OtBu) α-(OSu) (i.e. (tBuOCO) 2 CHCH 2 —CH(COOSu)—NH—CO(CH 2 ) 12 CH 3 ) dissolved in 800 μl of DMF. The reaction was conducted at 15° C. and it was stopped after 4.5 hours. The remaining process steps were performed as described in Example 34. The protection groups of the intermediate product were removed by TFA before purification by RP-HPLC and final isolation by precipitation and vacuum drying. 
     63 mg of the title compound were obtained. Molecular Mass, found by MS: 6090±3, theory: 6091. 
     The lipophilicity of the title compound, relative to human insulin, k′ rel =10. The determination was carried out as described on page 23 of the description.