| 摘要 |
New tetrapeptides having the formula A-R1-Ser(benzyl)-Tyr(benzyl)-R2-R3 wherein A is t-butoxycarbonyl, cyclohexylcarbonyl, benzyloxycarbonyl and p-nitrobenzyloxycarbonyl; R1 is L-Trp, L-Thr(benzyl), L-Met or Gly; Ser(benzyl) is D-Ser(benzyl) or L-Ser(benzyl); Tyr(benzyl) is D-Tyr(benzyl) or L-Tyr(benzyl); R2 is D-Ala, beta -Ala, D-Leu or D-Val; and R3 is lower alkoxy, hydrazino, amino, lower alkylamino or di(lower alkyl)amino.
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