4-[(Hydroxy)(4-methylphenyl)methylidene]isochroman-1,3-dione

In the title compound, C17H12O4, the six-membered heterocyclic ring adopts a distorted screw-boat conformation. The molecular structure exhibits an S(6) ring motif, owing to an intramolecular O—H...O hydrogen bond. In the crystal, weak C—H...O contacts generate an infinite chain along the c axis. There are also π–π stacking interactions between neighbouring isochromanedione benzene rings, with a centroid–centroid distance of 3.755 (1) , and C—O...π interactions with an O...centroid distance of 3.964 (2) .