N-(4-amino-2-sulfamoylphenyl)malonamic acid methyl ester   、                                                                                      
甲基磺酰氯                                                                                                                                                                                              以
                                                                                         
吡啶                                                                                  为溶剂,
                                                                                                                                                                                        以to form the intermediate compound N-(4-methanesulfonylamino-2-sulfamoyl-phenyl)-malonamic acid methyl ester (V)的产率得到N-(4-methanesulfonylamino-2-sulfamoylphenyl)malonamic acid methyl ester