Methyl 2,2′,7′-trihydroxy-1,1′-binaphthalene-3-carboxylate acetone solvate

In the title compound, C22H16O5, the two naphthyl units are approximately perpendicular. The 3-naphthylcarboxyl group and the ortho-hydroxyl group are involved in an intermolecular O-(HO)-O-... hydrogen bond with (OO)-O-... = 2.606 (2) angstrom. Molecules related by a glide plane are linked by an intermolecular O-(HO)-O-... hydrogen bond with (OO)-O-... = 2.747 (2) angstrom, creating a spiral. A solvent molecule is an acceptor in an O-(HO)-O-... hydrogen bond with (OO)-O-... = 2.700 (2) angstrom.