1-methyl N-trifluoroacetyl-D-glutamate 、
diethyl 2-(ethoxycarbonyl)-2-formamido-4-methylene-6-amino-1,7-heptanedioate 、
N,N'-二环己基碳二亚胺 生成 triethyl 1-formamido-5-[[(4R)-5-methoxy-5-oxo-4-[(2,2,2-trifluoroacetyl)amino]pentanoyl]amino]-3-methylidenepentane-1,1,5-tricarboxylate