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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.
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