Received 24 August 2010
Cabraleahydroxylactone, C27H44O3, isolated from the leaves of Aglaia exima, has three six-membered rings fused together that adopt chair conformations. Its two five-membered rings are enveloped shaped. The hydroxy group is in an axial position. It is a hydrogen-bond donor to the carbonyl O atom of an adjacent molecule; the O-HO interactions lead to the formation of a helical chain that runs along the b axis. There are two independent molecules in the asymmetric unit.
For the isolation and spectroscopic characterization of cabraleahydroxylactone from other Alglaia species, see: Su et al. (2006); Yang et al. (2008). For another compound from Aglaia exima, see: Awang et al. (2010).
Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BT5334 ).
We thank the University of Malaya for supporting this study.
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