5-chloro-2-(2-methylbutylamino)benzoic acid 、
4-bromo-L-phenylalanine methyl ester hydrochloride 、
2-(1h-Benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate 、
N,N-二异丙基乙胺 以to yield 3-(4-bromo-phenyl)-(2S)-[5-chloro-2-(2-methyl-butylamino)-benzoylamino]-propionic acid methyl ester的产率得到3-(4-bromophenyl)-(2S)-[5-chloro-2-(2-methylbutylamino)-benzoylamino]propionic acid methyl ester