organic compounds that contain a benzene ring fused to a xanthene ring.
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14-(3,4-dichlorophenyl)-14H-dibenzo[a,i]xanthene-8,13-dione
9,9?dimethyl?12?(3,4?dimethoxyphenyl)?9,10?dihydro?8H?benzo[a]xanthen?11(12H)?one