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Abstract
The title compound, C15H22O4, an eremophilane sesquiternoid, was isolated from the roots of Ligularia virgaurea. Both six-membered rings (A and B) adopt chair conformations and the five-membered ring is almost planar (r.m.s. deviation = 0.016 Å). The two methyl and two hydroxy groups adopt a syn conformation and the A/B ring junction is cis-fused. An intramolecular O—H⋯O hydrogen bond generates an S(6) ring. In the crystal, O—H⋯O hydrogen bonds link the molecules into [100] chains.
Highlights
The title compound, C15H22O4, an eremophilane sesquiternoid, was isolated from the roots of Ligularia virgaurea
O—HÁ Á ÁO hydrogen bonds link the molecules into [100] chains
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB6428)
Summary
The title compound, C15H22O4, an eremophilane sesquiternoid, was isolated from the roots of Ligularia virgaurea. Both six-membered rings (A and B) adopt chair conformations and the five-membered ring is almost planar (r.m.s. deviation = 0.016 A ). The two methyl and two hydroxy groups adopt a syn conformation and the A/B ring junction is cis-fused. An intramolecular O—HÁ Á ÁO hydrogen bond generates an S(6) ring. O—HÁ Á ÁO hydrogen bonds link the molecules into [100] chains. Related literature For further information on the isolation of the title compound, see Moriyama & Takahashi (1976); Zhang et al (2008).
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