Acta Cryst. (2006). E62, o4626-o4628 [ doi:10.1107/S1600536806037640 ]
Abstract: The title compound, 3,4,8,9,10-pentahydroxy-2-hydroxy-methyl-2,3,4,4a,6,10b-hexahydropyrano[3,2-c]isochromen-6-one hemihydrate, C13H14O9·0.5H2O, is a naturally occurring isocoumarin isolated from Rivea hypocrateriformis. The molecule contains three six-membered rings, viz. an aromatic ring, a glucopyranose ring and a -lactone ring. The water molecule lies on a twofold axis. The crystal structure is stabilized by an extensive network of O-HO hydrogen bonds and C-HO and C-H interactions.
Online 22 September 2006
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