Acta Cryst. (2011). E67, o1265 [ doi:10.1107/S1600536811015236 ]
Abstract: The title compound, C23H24O6, crystallizes with two independent molecules (A and B) in the asymmetric unit. The dihedral angles between the benzopyran ring and the ,-unsaturated ketone unit and between the ,-unsaturated ketone group and the benzene ring are 9.4 (10) and 12.96 (13)°, respectively, in molecule A and 1.40 (17) and 4.44 (17)°, respectively, in molecule B. The two methoxy groups at the meta positions of the benzene ring are close to being coplanar with the ring [C-O-C-C = 6.2 (3) and -1.4 (3)° in molecule A and -4.2 (4) and 3.7 (3)° in molecule B], whereas the third methoxy group, at the para position, is (+)-anticlinal with respect to the benzene ring [C-O-C-C = 81.7 (3)°] in molecule A and is (-)-synclinal with respect to the benzene ring [C-O-C-C = -103.2 (3)°] in molecule B. In both independent molecules, the hydroxy group is involved in an intramolecular O-HO hydrogen bond.
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