Acta Cryst. (2003). E59, o381-o383  [ doi:10.1107/S1600536803004227 ]

3,9-Dimethoxy-6a,11a-dihydro-6H-benzo[4,5]furo[3,2-c]chromene-4,10-diol monohydrate

T. Aree, S. Tip-pyang, S. Paramapojn and N. Chaichit

Abstract: In the title compound, also known as 4,10-dihydroxy-3,9-dimethoxypterocarpan monohydrate and melilotocarpan D monohydrate, C₁₇H₁₆O₆·H₂O, and the tetrahydropyran ring adopts a distorted envelope conformation and tetrahydrofuran ring displays an envelope conformation. The chroman moiety and benzofuran ring system are inclined at an angle of 45.81  (5)°. The molecular structure is stabilized by O-HO intramolecular interactions. In the crystal structure, the O-HO intermolecular hydrogen bonds link the molecules to form networks parallel to the ac plane; these are interconnected along the b axis by C-HO interactions.

Online 28 February 2003

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