A polypeptide of the formula: X.sub.1 -Tyr-Ser-X.sub.2 -X.sub.3 -His-Phe-Arg-Trp-Gly-Lys-Pro-Val-Gly-(Lys).sub.n -Y wherein X.sub.1 is .alpha.-aminoisobutyric acid, .beta.-alanine, L-serine, glycine, D-serine, D-alanine, .gamma.-aminobutyric acid or sarcosine residue; X.sub.2 is L-methionine, L-norleucine, L-isoleucine or L-norvaline residue; X.sub.3 is L-glutamic acid or L-glutamine residue; n is an integer of 1-4 and Y is a group of ##STR1## which is linked to the carbonyl group of the C-terminal lysine residue, wherein R.sub.1 and R.sub.2 are each hydrogen or the same or different lower alkyl having 1-5 carbon atoms, and R.sub.1 and R.sub.2, when taken together with or without another hetero atom, form a substituted or unsubstituted nitrogen containing heterocyclic ring, with the proviso that a peptide when X.sub.1 is a .alpha.-aminoisobutyric acid or D-serine, R.sub.1 and R.sub.2 are each hydrogen and n is 4 is excluded; non-toxic acid addition salts thereof and complexes thereof; being useful as a medicament owing to their strong adrenal-stimulating activity with protracted action and little side effects. They can be prepared by condensing the amino acids together one by one or by condensing the small peptide fragments together in a per se conventional manner.
一种
多肽的
化学式:X.sub.1-Tyr-Ser-X.sub.2-X.sub.3-His-Phe-Arg-Trp-Gly-Lys-Pro-Val-Gly-(Lys).sub.n-Y,其中X.sub.1是α-
氨基
异丁酸、
β-丙氨酸、
L-丝氨酸、甘
氨酸、
D-丝氨酸、
D-丙氨酸、γ-
氨基
丁酸或
肌氨酸残基;X.sub.2是
L-蛋氨酸、L-去亮
氨酸、
L-异亮氨酸或L-去缬
氨酸残基;X.sub.3是
L-谷氨酸或L-谷
氨酰胺残基;n是1-4的整数,Y是一个与C端赖
氨酸残基的羰基基团相连的##STR1##,其中R.sub.1和R.sub.2分别是氢或具有1-5个碳原子的相同或不同的低级烷基,当R.sub.1和R.sub.2与其他杂原子一起或不带其他杂原子形成取代或未取代的含氮杂环时,
多肽在X.sub.1为α-
氨基
异丁酸或
D-丝氨酸,R.sub.1和R.sub.2均为氢且n为4时被排除;其非毒性酸盐和配合物;由于它们具有持久作用和少副作用的强肾上腺刺激活性,因此可用作药物。它们可以通过逐个缩合
氨基酸或按照常规方法缩合小肽片段来制备。