3-Benzhydrylidene-4-isopropylidene-1-(methyl-phenyl-amino)-pyrrolidine-2,5-dione 生成 4,4-Dimethyl-2-(methyl-phenyl-amino)-9-phenyl-4,4a-dihydro-benzo[f]isoindole-1,3-dione 、 4,4-Dimethyl-2-(methyl-phenyl-amino)-9-phenyl-3a,4-dihydro-benzo[f]isoindole-1,3-dione