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Acta Cryst. (2013). E69, o578
[ doi:10.1107/S1600536813007381 ]

5,7-Dihydroxy-2-(3-hydroxy-4,5-dimethoxyphenyl)-6-methoxy-4H-chromen-4-one

S. M. Adizov, R. F. Mukhamathanova, K. K. Turgunov, I. D. Sham'yanov and B. Tashkhodjaev

Abstract: The title compound, C18H16O8, was isolated from the plant Artemisia baldshuanica Krasch et Zarp. The molecule is approximately planar, with the exception of the terminal methyl groups, the C atoms of which devitate from their attached ring planes by 1.243 (5) and 1.168 (5) Å. The dihedral angle between the substituted benzopyran and benzene rings is 5.8 (1)°; this near planarity could be due to conjugation or a packing effect. Intramolecular O-H...O and C-H...O hydrogen bonds occur. In the crystal, molecules are connected by O-H...O hydrogen bonds involving the hydroxy and carbonyl groups, forming hydrogen-bonded chains along [001] and [1-10]. The chains are linked by C-H...O interactions.


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