title: 5,8-Dimethyl-3-methyl-ene-2-oxo-3,3a,4,5,5a,6,8a,8b-octa-hydro-2H-1-oxa-s-indacene-5-carbaldehyde.
abstract: The title compound, C(15)H(18)O(3), was synthesized from 9α-hy-droxy-parthenolide (9α-hy-droxy-4,8-dimethyl-12-methyl-ene-3,14-dioxatricyclo-[9.3.0.0(2,4)]tetra-dec-7-en-13-one), which was isolated from the chloro-form extract of the aerial parts of Anvillea radiata. The five-membered lactone ring has a twisted conformation, while the six- and five-membered rings display chair and envelope conformations, respectively. The dihedral angle between the two five-membered rings is 50.57 (11)°.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Moumou
authors.forename: Ahmed
authors.initials: A
authors.lastname: Benharref
authors.forename: Moha
authors.initials: M
authors.lastname: Berraho
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Daran
authors.forename: Mohamed
authors.initials: M
authors.lastname: Akssira
authors.forename: Ahmed
authors.initials: A
authors.lastname: Elhakmaoui