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

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

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The title compound, C17H20O5, an eremophilane sesquiternoid, was isolated from the roots click here of Ligularia lapathifolia.The molecule 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 cashel tail bag 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 ethoxy groups adopt a syn conformation and the A/B ring junction is cis-fused.No directional intermolecular interactions could be identified in the crystal.