Acta Cryst. (2006). E62, o510-o512  [ doi:10.1107/S1600536805042984 ]

A guaianolide-type sesquiterpene lactone

Y. Zhu, M. Yang and Z.-J. Jia

Abstract: The title compound, 3-hydroxy-11H-guaia-4(15),10(14)-dien-12,6-olide, C₁₅H₂₀O₃, is a 5,7,5-tricyclic guaianolide. The hydroxy group is equatorial and the methyl group is axial. Three rings, viz. a five-membered, a seven-membered and a -lactone ring, are cis- and trans-fused to each other, and adopt half-chair, chair and envelope conformations, respectively. The crystal structure is stabilized by intermolecular O-HO hydrogen bonds between the hydroxy group and the -lactone carbonyl O atom along the b direction.

Online 11 January 2006

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