methyl 14-(2-methoxy-2-oxoethyl)-18-oxo-11-oxa-13-azatetracyclo[8.8.0.02,7.012,17]octadeca-1(10),2,4,6,8,12,14,16-octaene-15-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
sodium hydroxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                                                        以57.9%的产率得到monosodium mono(9-(carboxylatomethyl)-12-oxo-12H-benzo[5,6]chromeno[2,3-b]pyridine-10-carboxylate)