3-{2-[(3-(Guanidino)benzoyl)amino]acetamido}-3-phenyl-propanoic acid trifluoroacetate 、
20-O-[Nα-(phenylamino-thiocarbonyl)-L-lysyl-L-valyl]-camptothecin 在
1-羟基苯并三唑 、
盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 、
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以29%的产率得到[(19S)-19-ethyl-14,18-dioxo-17-oxa-3,13-diazapentacyclo[11.8.0.02,11.04,9.015,20]henicosa-1(21),2,4,6,8,10,15(20)-heptaen-19-yl] (2S)-2-[[(2S)-6-[[3-[[2-[[3-(diaminomethylideneamino)benzoyl]amino]acetyl]amino]-3-phenylpropanoyl]amino]-2-(phenylcarbamothioylamino)hexanoyl]amino]-3-methylbutanoate