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The title structure, 15,18-di­methyl-5-dioxo-14-oxapenta­cyclo­[11.4.1.02,15.04,13.06,11]­octadeca-3,6,8,10-tetraene-18-carb­aldehyde, C20H18O4, is a novel naphtho­quinone, isolated from Stereospermum personatum. In the bicyclic system, all three six-membered rings adopt a boat conformation. Two intermolecular C=O...H—C interactions link the mol­ecules into a chain.

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The title compound, 1-[2-hydroxy-4-methoxy-5-(3-methyl­but-2-enyl)­phenyl]-3-(4-hydroxy­phenyl)­prop-2-en-1-one (also known as bavachalcone), C21H22O4, is a polymorphic form of a previously reported structure [Bhalla et al. (1968). Tetrahedron Lett. 20, 2401–2406]. The mol­ecules in both polymorphs exhibit nearly identical conformations. In each polymorph, strong intra- and intermolecular hydrogen-bonded chains, involving the hydroxyl groups, are formed. A weak C—H...O interaction is seen in the present structure, but was not observed in the previously reported polymorph.
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