N-[m-(p-amidinobenzamido)benzoyl]-3-(t-butoxycarbonyl)-L-alanine methyl ester   、                                                                                      trifluoracetic acid-dichloromethane                                                                                                                                                              在
                                                                                                                                                                                 
乙醇乙醚                                                                                                                                  作用下,
                                                                                                                                                                                        反应 3.0h,
                                                                                                                以is obtained (S)-3-[m-(p-amidinobenzamido)benzamido]-3-(methoxycarbonyl)propionic acid trifluoroacetate in the form of a colourless solid的产率得到(S)-3-[m-(p-amidinobenzamido)benzamido]-3-(methoxycarbonyl)propionic acid trifluoroacetate