4-[2-(3,5-Bis-trifluoromethyl-benzyloxy)-1-(4-methoxycarbonylmethyl-piperazin-1-yl)-ethyl]-benzoic acid methyl ester   、                                                                                      
氢氧化钾                                                                                                                                                              在
                                                                                                                                                                                 
盐酸   、                                                                                                  
二氯甲烷   、                                                                                                  
magnesium sulfate   、                                                                                                  silica gel   、                                                                                                  Dichloromethane methanol water   、                                                                                                  4-[2-(3,5-Bis-trifluoromethyl-benzyloxy)-1-(4-carboxymethyl-piperazin-1-yl)-ethyl]-benzoic acid methyl ester hemihydrate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 16.0h,
                                                                                                                以to yield 4-[2-(3,5-bis-trifluoromethyl-benzyloxy)-1-(4-carboxymethyl-piperazin-1-yl)-ethyl]-benzoic acid methyl ester hemihydrate (compound 318; 1.5 g, 71%)的产率得到4-[2-(3,5-Bis-trifluoromethyl-benzyloxy)-1-(4-carboxymethyl-piperazin-1-yl)-ethyl]-benzoic acid methyl ester hemihydrate