Received 8 April 2011
The title compound, C32H49NO4, has been isolated from the dichloromethane extract of the stem bark of Garcinia atroviridis Griff. ex T. Anders. Rings A and B, B and C, and C and D are trans-fused, whereas rings D and E are cis-fused. Rings A, B, C and E have slightly distorted chair conformations, while ring D is most heavily distorted towards a half-chair conformation owing to the strain induced by the lactonization. The ester group attached to ring A is in an equatorial position.
For details and applications of Garcinia atroviridis Griff. ex T. Anders, see: Permana et al. (2001); Amran et al. (2009). For bond-length data, see: Allen et al. (1987). For ring conformations, see: Cremer & Pople (1975). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986).
Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: IS2699 ).
TWN, WKC and MK wish to acknowledge the research grant RU1001/PKIMIA/811129 provided by the Universiti Sains Malaysia, Penang, that has resulted in this article. TWN would like to thank USM for the award of a postgraduate fellowship. MH and HKF thank the Malaysian Government and Universiti Sains Malaysia for the Research University grant No. 1001/PFIZIK/811160. MH also thanks Universiti Sains Malaysia for a postdoctoral research fellowship.
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