Received 13 September 2011
aDepartment of Chemistry, Shahid Beheshti University, General Campus, Tehran, Iran,bDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia, and cChemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203 Jeddah, Saudi Arabia
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The eudesmane-type terpenoid, C20H30O5, isolated from Sclerorhachis platyrachis, has a decalin skeleton whose six-membered rings adopt chair conformations. The two methyl substituents occupy axial positions, whereas the other three substituents occupy equatorial positions. The hydroxy group is an intramolecular hydrogen-bond donor to the single-bond ester O atom; adjacent molecules are linked through the carboxylic acid interacting with the hydroxyl group, forming a hydrogen-bonded chain running along the c axis.
For the crystal structure of epiilic acid, see: Daniewski et al. (1986). For a review of eudesmane-type sesquiterpenoids, see: Wu et al. (2006).
Data collection: CrysAlis PRO (Agilent, 2010); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; 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: JH2330 ).
The authors thank Shahid Beheshti University and the University of Malaya for supporting this study.
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