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. 2013 Jun 12;69(Pt 7):o1087.
doi: 10.1107/S1600536813015729. eCollection 2013.

8β-Eth-oxy-eremophil-3,7(11)-diene-8α,12;6α,15-diolide

Dong-Qing Fei  1 , Le-Le Dong, Hui-Hong Li, Zhan-Xin Zhang
Affiliations

8β-Eth-oxy-eremophil-3,7(11)-diene-8α,12;6α,15-diolide

Dong-Qing Fei et al. Acta Crystallogr Sect E Struct Rep Online. .

Abstract

The title compound, C17H20O5, an eremophilane sesquiternoid, was isolated from the roots of Ligularia lapathifolia. The mol-ecule contains four fused rings of which the six-membered ring A adopts a half-chair conformation, the six-membered ring B adopts a chair conformation, the five-membered ring C is almost planar (r.m.s. deviation = 0.015 Å) and the five-membered ring D adopts an envelope conformation with the quaternary C atom as the flap. The methyl and the eth-oxy groups adopt a syn conformation and the A/B ring junction is cis-fused. No directional inter-molecular inter-actions could be identified in the crystal.

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Figures

Fig. 1.
Fig. 1.
The molecular structure of the title compound, showing displacement ellipsoids at the 30% probability level.
See this image and copyright information in PMC

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