4-(N,N-di-n-pentylcarbamoyl)-1-(N,N-diphenylcarbamoyl)-2-(2-(N-methyl-N-(t-butoxycarbonyl)amino)-N-(methyl)ethylaminocarbonyl)piperazine                                                                                                                                                              在
                                                                                                                                                                                 
三氟乙酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
苯甲醚                                                                                  为溶剂,
                                                                                                                                                                                        以130 mg (98%)的产率得到(S)-4-(N,N-di-n-pentylcarbamoyl)-1-(N,N-diphenylcarbamoyl)-2-(2-(N-methylamino)-N-(methyl)ethylaminocarbonyl)piperazine trifluoroacetic acid salt