Acta Cryst. (2013). E69, o578 [ doi:10.1107/S1600536813007381 ]
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-HO and C-HO hydrogen bonds occur. In the crystal, molecules are connected by O-HO hydrogen bonds involving the hydroxy and carbonyl groups, forming hydrogen-bonded chains along  and [1-10]. The chains are linked by C-HO interactions.
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