Acta Cryst. (2009). E65, o471-o472  [ doi:10.1107/S1600536809002074 ]

(2S,4aR,6aR,7R,9S,10aS,10bR)-7-Carboxy-2-(3-furyl)-6a,10b-dimethyl-4,10-dioxoperhydrobenzo[f]isochromen-9-yl acetate

P. Carvalho, L. M. Kutrzeba, J. K. Zjawiony and M. A. Avery

Abstract: The asymmetric unit of the title compound, C₂₂H₂₆O₈, contains two crystallographically independent molecules with closely comparable conformations (r.m.s. overlay = 0.54 Å for 30 non-H atoms). All six-membered rings display chair conformations, with a slight distortion for the lactone ring. The molecules are connected by O-HO hydrogen bonds into chains along [010], with the independent molecules segregated into separate chains. The two molecules in the asymmetric unit face each other in a head-to-tail fashion, with the furan ring of one molecule turned towards the carboxylic acid terminal of the other molecule.

Online 6 February 2009

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