三氟乙酸   、                                                                                      
(R)-2-((S)-4-tert-Butoxycarbonyl-4-{4-[(2,7-dimethyl-4-oxo-3,4-dihydro-quinazolin-6-ylmethyl)-methyl-amino]-benzoylamino}-butyrylamino)-pentanedioic acid di-tert-butyl ester                                                                                                                                                                                                                                                                      反应 1.25h,
                                                                                                                以90%的产率得到(R)-2-((S)-4-Carboxy-4-{4-[(2,7-dimethyl-4-oxo-3,4-dihydro-quinazolin-6-ylmethyl)-methyl-amino]-benzoylamino}-butyrylamino)-pentanedioic acid; compound with trifluoro-acetic acid