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The title compound, C 19 H 26 O 3 , was synthesized directly from the condensation of 5,5-dimethyl­cyclo­hexane-1,3-dione with malononitrile catalysed by palladium chloride: there are two molecules in the asymmetric unit.

3,3,6,6,9,9-Hexamethyl-2,3,4,5,6,7,8,9-octahydro-1H-xanthene-1,8-dione