三氟乙酸 、
(R)-4-((S)-2-tert-Butoxycarbonylamino-propionylamino)-4-carbamoyl-butyric acid 4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,11-heptadecafluoro-undecyl ester 生成 (R)-4-((S)-2-Amino-propionylamino)-4-carbamoyl-butyric acid 4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,11-heptadecafluoro-undecyl ester; compound with trifluoro-acetic acid