4-[Hydroxy(phenyl)methylene]-5-oxo-3-phenyl-2-cyclohexenecarboxylic Acid

In the title compound, C₂₀H₁₆O₄, the cyclohexene ring adopts a twisted boat conformation. The molecule contains an enol subunit and the hydroxyl group forms an intra­molecular hydrogen bond to the cyclic carbonyl group, with an O...O distance of 2.485 (3) Å and an O—H...O angle of 148 (3)°. Enantiomeric pairs of molecules form centrosymmetric dimers by mutual hydrogen bonding of carboxyl groups, with O...O distances of 2.649 (3) Å.

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