Received 17 January 2010
The title compound [systematic name: 17-(5,6-dimethylhept-6-en-2-yl)-4,4,10,13,14-pentamethyl-1,5,6,10,11,12,13,15,16,17-decahydro-2H-cyclopentaphenanthren-3(4H,9H,14H)-one], C31H50O, is a triterpenoid which was isolated from Skimmia laureola. The three six-membered rings adopt chair, slightly distorted half-chair and distorted boat conformations, and the five-membered ring is in an envelope conformation. All the rings are trans fused. In the crystal structure, there is a weak C-HO hydrogen bond.
Data collection: COLLECT (Nonius, 1998); cell refinement: HKL DENZO (Otwinowski & Minor, 1997); data reduction: SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LH2983 ).
Allen, F. H., Kennard, O., Watson, D. G., Brammer, L., Orpen, A. G. & Taylor, R. (1987). J. Chem. Soc. Perkin Trans. 2, pp. S1-19.
Blessing, R. H. (1997). J. Appl. Cryst. 30, 421-426.
Cremer, D. & Pople, J. A. (1975). J. Am. Chem. Soc. 97, 1354-1358.
Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565.
Hussain, N., Habib-ur-Rehman, & Parvez, M. (2009). Acta Cryst. E65, o1202.
Nonius (1998). COLLECT. Nonius BV, Delft, The Netherlands.
Otwinowski, Z. & Minor, W. (1997). Methods in Enzymology, Vol. 276, Macromolecular Crystallography, Part A, edited by C. W. Carter Jr & R. M. Sweet, pp. 307-326. New York: Academic Press.
Schun, Y., Cordell, G. A., Cox, P. J. & Howie, R. A. (1986). Phytochemistry, 25, 753-755.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.