Disclosed is a novel peptide having one of the formulae: ##STR1## (A and B are the amino acids: wherein if A is D- or L-Pro, B is Har or Cit; if A is D-Pro, B is D-Arg, and if B is D- or L-Arg, A is Sar, Pip, Aze or Arg) Asn-A-L-(D-)Pro-Arg-(Gly).sub.n (A is Ser, Thr or Ala, n is 1 or 0) A-Ser-Pip-Arg (A is Pro-Asn-, Asn- or Pro-) ##STR2## (A is cyclopentylcarbonyl, Pro or pGlu; B is Gly or .beta.-Ala, W is a hydrogen atom or a group having the formula: or a peptide having the formula: ##STR3## wherein A and B have the same meanings as mentioned above, respectively pGlu-Asn-Ser-A-B-(Gly).sub.n (A is Aze, D- or L-Pro, Pip or Sar, B is D- or L-Arg, Cit, Har, Lys or Orn, n is 1 or 0) and Pro-(Asn).sub.m -Ser-L-(D-)Pro-Arg-(Gly).sub.n (m and n are independently 0 or 1) their functional derivatives, and pharmaceutically acceptable salts thereof.
本发明涉及一种新的肽,其具有以下公式之一:##STR1##(其中A和B是
氨基酸:如果A是D-或L-Pro,则B是Har或Cit;如果A是D-Pro,则B是D-Arg,如果B是D-或L-Arg,则A是Sar、Pip、Aze或Arg)Asn-A-L-(D-)Pro-Arg-(Gly) .sub.n(其中A是Ser、Thr或Ala,n为1或0)A-Ser-Pip-Arg(其中A是Pro-Asn-、Asn-或Pro-)##STR2##(其中A是环戊基甲酰、Pro或pGlu;B是Gly或β-Ala,W是氢原子或具有以下公式的基团:或具有以下公式的肽:##STR3##其中A和B分别具有上述相同的含义,pGlu-Asn-Ser-A-B-(Gly) .sub.n(其中A是Aze、D-或L-Pro、Pip或Sar,B是D-或L-Arg、Cit、Har、Lys或Orn,n为1或0),以及Pro-(Asn) .sub.m-Ser-L-(D-)Pro-Arg-(Gly) .sub.n(其中m和n独立地为0或1),它们的功能衍
生物和药学上可接受的盐。