Acta Cryst. (2006). E62, o4891-o4893  [ doi:10.1107/S1600536806040281 ]

A new triterpene of Miconia macrothyrsa leaves: 28-carboxy-3-oxoolean-12-en-21-yl acetate

R. Diniz, M. C. S. Vidigal, D. S. Raslan and N. G. Fernandes

Abstract: The title compound, C₃₂H₄₈O₅, isolated from the leaves of Miconia macrothyrsa, is a pentacyclic triterpene, in which rings A, B, D and E take a chair conformation, while ring C has a half-chair conformation. Rings A and B and rings B and C are trans-fused, while rings D and E are cis-fused. In the crystal structure, there are intermolecular O-HO hydrogen bonds and intramolecular C-HO hydrogen bonds.

Online 11 October 2006

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