G. Swamy, K. Ravikumar, B. Sridhar
Aug 15, 2006
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Journal
Acta crystallographica. Section C, Crystal structure communications
Abstract
The title compound [systematic name: 5-hydroxy-2-(3-hydroxy-4,5-dimethoxyphenyl)-3,6,7-trimethoxy-4H-chromen-4-one], C20H20O9, was isolated from the seeds of Cleom viscosa Linn. Two independent molecules (A and B) are present in the asymmetric unit with almost similar conformations. The dihedral angles between the fused chromene ring system and the benzene ring bonded to it in molecules A and B are 4.2 (1) and 12.7 (1)°, respectively. The hydroxy O atoms are involved in intramolecular hydrogen bonding. The molecules are linked by C—H⋯O and O—H⋯O interactions into chains of edge-fused R33(22) rings. Aromatic π–π and weak C—H⋯π(arene) interactions are also observed.