Acta Cryst. (2012). E68, o3 [ doi:10.1107/S1600536811050975 ]
Abstract: 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-HO hydrogen bond. In the crystal, weak C-HO contacts generate an infinite chain along the c axis. There are also - stacking interactions between neighbouring isochromanedione benzene rings, with a centroid-centroid distance of 3.755 (1) Å, and C-O interactions with an Ocentroid distance of 3.964 (2) Å.
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