Acta Cryst. (2002). E58, o285-o287  [ doi:10.1107/S1600536802002660 ]

Cirsimaritin

N.H.-H. Chou, M. Parvez, M. S. Ali, S. Ahmed and W. Ahmed

Abstract: The crystal structure of the title compound, 5,4'-dihydroxy-6,7-dimethoxyflavone, C₁₇H₁₄O₆, isolated from Salvia nubicola, is composed of chains that are stabilized by conventional (O-HO type) intramolecular and intermolecular hydrogen bonds with OO being 2.5780  (16) and 2.7459  (15)  Å, respectively. The benzopyran ring is essentially planar with hydroxyl and carbonyl O atoms lying close to its mean plane, the methoxyl groups inclined at 65.90  (11) and 8.39  (10)°, and the phenyl ring oriented at 23.30  (6)° from the benzopyran ring. The mean bond distances are: O-Csp³ 1.4372  (18), O-Csp² 1.365  (12), Csp²-Csp² 1.448  (17), C-C_aromatic 1.393  (10) and C=O 1.2559  (19)  Å.

Online 22 February 2002

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