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The title compound, C 18 H 14 O 3 , consists of a four-ring system which contains three six-membered rings forming a phenanthrene­dione system and a five-membered 1,2-dihydro­methyl­furan ring. A three-dimensional supra­molecular framework is formed  via  non-classical inter­molecular C—H⋯O hydrogen bonds.

3,9-Dimethyl-2,3-dihydrophenanthro[1,2-b]furan-4,5-dione