In the title compound, C(17)H(14)O(6), the benzopyran ring system is essentially planar and forms a dihedral angle of 6.84 (4)° with the other benzene ring. In the crystal structure, centrosymmetrically related mol-ecules are linked into dimers by O-H⋯O hydrogen bonds. The crystal packing is controlled by C-H⋯π and π-π stacking inter-actions involving the benzopyran and benzene rings, with centroid-centroid distances between 3.645 (2) and 3.986 (2) Å.