prolyl-Nγ-tosyl-α,γ-diaminobutyryl-glycine amide 、
tosyl-S-benzylcysteinyl-tyrosyl-D-phenylalanyl-glutaminyl-asparaginyl-S-benzylcysteine 在
1-羟基苯并三唑 、
N,N'-二环己基碳二亚胺 作用下,
以60%的产率得到tosyl-S-benzylcysteinyl-tyrosyl-D-phenylalanyl-glutaminyl-asparaginyl-S-benzylcysteinyl-prolyl-N
γ-tosyl-α,γ-diaminobutyryl-glycine amide