(S)-3-(4-Benzyloxycarbonylamino-phenyl)-2-(2-nitro-phenylsulfanylamino)-propionic acid 2,4,5-trichloro-phenyl ester 、 3-((S)-3-{(S)-2-[(S)-2-((2S,3S)-2-Amino-3-methyl-pentanoylamino)-4-carbamoyl-butyrylamino]-3-carbamoyl-propionylamino}-4-{(R)-2-[(S)-1-(carbamoylmethyl-carbamoyl)-3-methyl-butylcarbamoyl]-pyrrolidin-1-yl}-4-oxo-butylsulfanyl)-propionic acid 以55%的产率得到o-nitrobenzenesulfenyl-p-benzyloxycarbonylaminophenylalanyl-isoleucyl-glutaminyl-asparaginyl-S-(β-carboxyethyl)homocysteinyl-prolyl-leucyl-glycine amide