title: (1S,3R,8R,9S,11R)-2,2,10,10-Tetra-chloro-3,7,7,11-tetra-methyl-tetra-cyclo-[6.5.0.0(1,3).0(9,11)]trideca-ne.
abstract: The title compound, C(17)H(24)Cl(4), was synthesized from β-himachalene (3,5,5,9-tetra-methyl-2,4a,5,6,7,8-hexa-hydro-1H-benzocyclo-heptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The mol-ecule is built up from fused six- and seven-membered rings and two three-membered rings from the reaction of β-himachalene with dichloro-carbene. The six-membered ring shows a chair conformation, whereas the seven-membered ring displays a boat conformation.
authors: Laboratoire de Chimie Biomoléculaire, Substances Naturelles et Réactivité "Unité Associée au CNRST(URAC16)", Faculté des Sciences Semlalia, BP 2390, Bd My Abdellah, 40000 Marrakech,  Morocco.
authors: Najia
authors: N
authors: Ourhriss
authors: Ahmed
authors: A
authors: Benharref
authors: Mohamed
authors: M
authors: Saadi
authors: Lahcen
authors: L
authors: El Ammari
authors: Moha
authors: M
authors: Berraho