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In the title compound (systematic name: 3,7,9-trihydroxy-1-methyl-6H-benzo[c]chromen-6-one), C14H10O5, the methyl group is shifted out of the molecular plane due to a steric collision, thus causing a slight twist of the benzene rings. The molecular structure is stabilized by an intramolecular O—H...O hydrogen bond, generating an S(6) ring. In the crystal, molecules are connected by intermolecular O—H...O hydrogen bonds into a three-dimensional network.