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A heptaester of a new diterpene alcohol was isolated from the dichloromethane extract of the whole plant of Euphorbia esula L. A detailed NMR and mass spectral analysis revealed that its structure is (E)-(2R*, 3R*, 4S*, 5R*, 7S*, 8R*, 9S*, 13R*, 15R*)-2,3,5,8,9-pentaacetoxy-7-isobutanoyloxy-14-oxojatropha-6(17),11-diene. Its conformation was studied in three different solutions. The temperature dependence of the spectral parameters revealed conformational changes through internal rotation of the macrocycle part of the molecule.
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Günther et al. (1999) studied this question.
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