H-Cys(Trt)-Ala-Leu-OMe 、 N-tert.-Butyloxycarbonyl-S-trityl-L-cysteinyl-S-diphenylmethyl-L-cysteinyl-L-alanyl-glycyl-L-valin-methylester 在
sodium hydroxide 、 N-succinimide 、
N,N'-二环己基碳二亚胺 作用下,
生成 N-tert.-Butyloxycarbonyl-S-trityl-L-cysteinyl-S-diphenylmethyl-L-cysteinyl-L-alanyl-glycyl-L-valyl-S-trityl-l-cysteinyl-L-alanyl-L-leucin-methylester