N-Boc-4(S)-amino-3(S)-hydroxy-6-methylsulfanyl-hexanoic acid 、 4-[((S)-2-amino-3-methylbutyrylamino)methyl]benzoic acid methyl ester 在
盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 作用下,
生成 4-{[(S)-2-((3S,4S)-4-tert-Butoxycarbonylamino-3-hydroxy-6-methylsulfanyl-hexanoylamino)-3-methyl-butyrylamino]-methyl}-benzoic acid methyl ester