Acta Cryst. (2007). E63, o2104-o2105  [ doi:10.1107/S160053680701478X ]

The absolute configuration of heliespirone B, from sunflower Helianthus annuus

F. A. Macías and F. R. Fronczek

Abstract: The absolute configuration of the title compound [systematic name: 5-hydroxy-8-(1-hydroxyisopropyl)-3,11-dimethyl-7-oxaspiro[5.5]undec-3-en-2-one], C₁₅H₂₄O₄, has been determined using Cu K data at 100 K. The configurations at its four asymmetric C centers are 1R, 2S, 7R and 10S. There are two independent molecules in the asymmetric unit, and they form hydrogen-bonded chains in the [100] direction using only the OH groups.

Online 4 April 2007

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