(S)-1-((S)-2-{2-[(S)-2-((S)-2-tert-Butoxycarbonylamino-3-phenyl-propionylamino)-3-methyl-butyrylamino]-acetylamino}-3-methyl-butyryl)-pyrrolidine-2-carboxylic acid 4-nitro-phenyl ester 、
三氟乙酸 生成 (S)-1-((S)-2-{2-[(S)-2-((S)-2-Amino-3-phenyl-propionylamino)-3-methyl-butyrylamino]-acetylamino}-3-methyl-butyryl)-pyrrolidine-2-carboxylic acid 4-nitro-phenyl ester; compound with trifluoro-acetic acid