[6-(6-Morpholin-4-yl-4-oxo-4h-pyran-2-yl)-thianthren-2-yloxy]-acetic acid methyl ester   、                                                                                      
sodium hydroxide                                                                                                                                                                                              以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以to give the title compound (22.4 mg, 100%)的产率得到[6-(6-morpholin-4-yl-4-oxo-4H-pyran-2-yl)-thianthren-2-yloxy]-acetic acid sodium salt