Acta Cryst. (2010). E66, o607 [ doi:10.1107/S1600536810005167 ]
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
Copyright © International Union of Crystallography