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. 2013 Jul 20;69(Pt 8):o1290.
doi: 10.1107/S1600536813019703. eCollection 2013.

Isotenulin

Kyle S Knight  1 , Cole T Smith, Thomas G Waddell
Affiliations

Isotenulin

Kyle S Knight et al. Acta Crystallogr Sect E Struct Rep Online. .

Abstract

Isotenulin, C17H22O5, is a sesquiterpene lactone isolated from sneezeweed Helenium amarum. It crystallizes with two independent mol-ecules in the asymmetric unit. In each mol-ecule, two five-membered rings (cyclo-pentenone and lactone) are trans-fused to the central seven-membered ring. The five-membered rings each adopt envelope conformations. The seven-membered ring adopts a twist-chair conformation. In the crystal, the molecules are linked by C-H⋯O interactions, which generate a three-dimensional network.

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Figures

Fig. 1.
Fig. 1.
Two independent molecules of isotenulin with the atomic numbering and displacement ellipsoids drawn at the 50% probability level.
See this image and copyright information in PMC

References

    1. Barton, D. H. R. & De Mayo, P. (1956). J. Chem. Soc. pp. 142–149.
    1. Braun, B. H., Herz, W. & Rabindran, K. (1956). J. Am. Chem. Soc. 78, 4423–4429.
    1. Bruker (2009). APEX2 and SAINT Bruker AXS Inc., Madison, Wisconsin, USA.
    1. Clark, E. P. (1939). J. Am. Chem. Soc. 61, 1836–1840.
    1. Dolomanov, O. V., Bourhis, L. J., Gildea, R. J., Howard, J. A. K. & Puschmann, H. (2009). J. Appl. Cryst. 42, 339–341.