dimethyl 9-oxo-4-(p-tolyl)-4,9-dihydro-1H-1,4-epoxyxanthene-2,3-dicarboxylate

2-trichloromethyl-4-chromone

2-氨基-3-甲酰色酮

4-氯-3-硝基香豆素

色酮-3-甲醛