Received 27 August 2010
aDepartment of Chemistry, University of Karachi, Karachi 75270, Pakistan,bH.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Science, University of Karachi, Karachi 75270, Pakistan, and cChemistry Department, Loughborough University, Loughborough, Leicestershire LE11 3TU, England
Correspondence e-mail: firstname.lastname@example.org
In the title molecule, C20H26O3, a clerodane diterpenoid isolated from Dodonaea viscosa, the trans-fused six-membered rings of the decaline system display chair conformations. The five-membered lactone ring adopts an envelope conformation and the five-membered furan ring is essentially planar with a maximum deviation of 0.0052 (12) Å.
For the absolute stereochemistry of the title compound from NMR and literature data, see: Jefferies & Payne (1967). For background to natural product chemistry, see: Arfan et al. (2010); Khan et al. (2005).
Data collection: APEX2 (Bruker, 1998); cell refinement: SAINT (Bruker, 1998); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008b) and OLEX2 (Dolomanov et al., 2009); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008b) and OLEX2; molecular graphics: SHELXTL (Sheldrick, 2008b); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: PV2325 ).
The authors thank the Higher Education Commission of Pakistan for financial support.
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