Pomiferin

The crystal structure of pomiferin, 3-(3,4-di­hydroxy­phenyl)-5-hydroxy-8,8-di­methyl-6-(3-methyl­but-2-enyl)-4H,8H-pyrano[2,3-h]­chromen-4-one, C₂₅H₂₄O₆, has been determined. The benzo­pyran­one ring system is nearly planar and the dihedral angle between the phenyl ring and the benzo­pyran­one moiety is 40.85 (4)°. The crystal structure is stabilized by a one-dimensional chain of inter- and intramolecular O—H⃛O hydrogen bonds, with O⃛O distances in the range 2.5546 (15)–2.7999 (16) Å.