Acta Cryst. (2010). E66, o2161  [ doi:10.1107/S1600536810029831 ]

3-Acetoxy-8,10-dihydroxy-6-methoxyeremophil-7(11)-en-8,12-olide

H.-B. Wu, H. Li, X.-C. Lan and W.-S. Wang

Abstract: The title compound, C₁₈H₂₆O₇, is an eremophilenolide which has been isolated from the plant Ligularia duciformis for the first time. The present study confirms the atomic connectivity assigned on the basis of ¹H and ¹³C NMR spectroscopy. The molecule contains three fused rings, two six-membered rings in chair confomations and a five-membered ring in a flattened envelope conformation. Two hydroxy groups are involved in formation of intra- and intermolecular O-HO hydrogen bonds. The latter ones link molecules into chains propagating in [010].

Online 31 July 2010

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