N-[3-(4-fluorophenyl)-7,9-dimethyl-4,5-dioxo-5a,6,9,9a-tetrahydrobenzo[g][1]benzofuran-6-yl]acetamide                                                                                                                                                              在
                                                                                                                                                                                 
silica gel                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
7,9-dimethyl-3-(4-fluorophenyl)naphtho[1,2-b]furan-4,5-dione   、                                                                                             
7,9-dimethyl-3-(4-fluorophenyl)-6-acetamidonaphtho[1,2-b]furan-4,5-dione