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