title: (1S,3R,8R,9S,11R)-10,10-Di-bromo-2,2-di-chloro-3,7,7,11-tetra-methyl-tetra-cyclo-[6.5.0.0(1,3).0(9,11)]trideca-ne.
abstract: The title compound, C17H24Br2Cl2, was synthesized from β-himachalene (3,5,5,9-tetra-methyl-2,4a,5,6,7,8-hexa-hydro-1H-benzo-cyclo-heptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The asymmetric unit contains two independent mol-ecules. Each mol-ecule is built up from fused six-, seven- and two three-membered rings. In both mol-ecules, the six-membered ring has a half-chair conformation, whereas the seven-membered ring displays a boat conformation. No specific inter-molecular inter-actions are noted in the crystal packing.
authors.affiliation: Laboratoire de Chimie Biomoléculaire, Substances Naturelles et Réactivité, Unité Associée au CNRST (URAC16)", Université Cadi Ayyad, Faculté des Sciences Semlalia, BP 2390, Bd My Abdellah, 40000 Marrakech, Morocco.
authors.forename: Abdelouahd
authors.initials: A
authors.lastname: Oukhrib
authors.forename: Ahmed
authors.initials: A
authors.lastname: Benharref
authors.forename: Mohamed
authors.initials: M
authors.lastname: Saadi
authors.forename: Moha
authors.initials: M
authors.lastname: Berraho
authors.forename: Lahcen
authors.initials: L
authors.lastname: El Ammari