Acta Cryst. (2010). E66, o607  [ doi:10.1107/S1600536810005167 ]

4'-Bromobutyl ent-16-oxobeyeran-19-oate

J. Chen and X. Zha

Abstract: The title compound, C₂₄H₃₇BrO₃, is a tetracyclic diterpenoid with a beyerane skeleton, synthesized by esterification of isosteviol. It comprises a fused four-ring system A/B/C/D. Rings A and B have a chair conformation, whereas ring C is an unsymmetrical distorted chair; the remaining five-membered ring D adopts an envelope conformation. The stereochemistry of the A/B and B/C ring junctions are trans, while the C/D junction is cis.

Online 13 February 2010

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