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Mol­ecules of the title compound, C18H16O6, are almost planar. The dihedral angle between the benzopyran system and the benzene ring is 3.36 (5)°. In addition to an intra­molecular O—H...O hydrogen bond, mol­ecules are connected by weak inter­molecular C—H...O hydrogen bonds to form a two-dimensional framework.

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The γ-pyran­one ring of the title mol­ecule, C16H14O5, adopts an envelope conformation. The crystal packing is stabilized by O—H...O and C—H...O hydrogen bonding.
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