Rademeyer, MelanieVan Heerden, Fanie R.Van der Merwe, Marina M.2009-11-252009-11-252009Rademeyer, M, Van Heerden, FR & Van Der Merwe, MM 2009, 'Dehydrobrachylaenolide: an eudesmanetype sesquiterpene lactone', Acta Crystallographica, E65, p. 196. [http://journals.iucr.org/e/journalhomepage.html]1600-536810.1107/S1600536808042402http://hdl.handle.net/2263/12038The three-ring eudesmanolide, C15H16O3, is a natural product isolated from Dicoma anomala Sond. (Asteraceae). The compound contains an endo–exo cross conjugated methylenecyclohexenone ring with an envelope conformation transfused with cyclohexane and trans-annelated with an - methylene -lactone. The absolute structure was assigned by optical rotation measurements compared to those from the synthetic compound with known stereochemistry. The crystal packing is consolidated by C—H...O interactions.enInternational Union of CrystallographySingle-crystal X-ray studyT = 150 KMean (C–C) = 0.002 A°R factor = 0.033wR factor = 0.095Data-to-parameter ratio = 14.1LactonesStereochemistryDehydrobrachylaenolide : an eudesmanetype sesquiterpene lactoneArticle