ethyl ({2-cyano-4-[2-({5-hydroxy-2-[(4-methoxybenzylamino)carbonyl]-4-oxo-4H-chromen-7-yl}oxy)ethyl]phenyl}amino)(oxo)acetate                                                                                                                                                              在
                                                                                                                                                                                 lithium hydroxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                                                        以62%的产率得到[(2-cyano-4-{2-[(5-hydroxy-2-{[(4-methoxyphenyl)methyl]carbamoyl}-4-oxo-4H-chromen-7-yl)oxy]ethyl}phenyl)carbamoyl]formic acid