三氟乙酸 、
反应 2.0h,
以100%的产率得到{[(S)-1-((S)-Pyrrolidine-2-carbonyl)-pyrrolidine-2-carbonyl]-amino}-acetic acid (1S,2R,3S)-1-methoxymethyl-2,3-bis-(2-{[(S)-1-((S)-pyrrolidine-2-carbonyl)-pyrrolidine-2-carbonyl]-amino}-acetoxymethyl)-cyclopropylmethyl ester; compound with trifluoro-acetic acid