5-(4-tert-butyl-benzenesulfonylamino)-3-(4-methoxyphenyl)-1H-indol-2-carboxylic acid ethyl ester   、                                                                                      
sodium hydroxide                                                                                                                                                                                              以
                                                                                         
water ethanol                                                                                  为溶剂,
                                                                                                                                                                                        以the product 5-(4-tert-butylbenzenesulfonylamino)-3-(4-methoxyphenyl)-1H-indole-2-carboxylic acid is obtained in a quantitative yield的产率得到5-(4-tert-butyl-benzenesulfonylamino)-3-(4-methoxyphenyl)-1H-indol-2-carboxylic acid