三氟乙酸   、                                                                                      
[(S)-1-(3-{3,5-Bis-[3-((S)-2-tert-butoxycarbonylamino-4-methylsulfanyl-butyrylamino)-propyl]-phenyl}-propylcarbamoyl)-3-methylsulfanyl-propyl]-carbamic acid tert-butyl ester                                                                                                                                                                                              以
                                                                                         various solvents                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以98.8%的产率得到(S)-2-Amino-N-(3-{3,5-bis-[3-((S)-2-amino-4-methylsulfanyl-butyrylamino)-propyl]-phenyl}-propyl)-4-methylsulfanyl-butyramide; compound with trifluoro-acetic acid