Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 7 (July 2013)

organic compounds

Acta Cryst. (2013). E69, o1087    [ doi:10.1107/S1600536813015729 ]


D.-Q. Fei, L.-L. Dong, H.-H. Li and Z.-X. Zhang

Abstract: The title compound, C17H20O5, an eremophilane sesquiternoid, was isolated from the roots 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 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.

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