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The title compound, C 17 H 24 Br 2 Cl 2 , was synthesized from β-himachalene (3,5,5,9-tetra­methyl-2,4a,5,6,7,8-hexa­hydro-1 H -benzo­cyclo­heptene), which was isolated from the essential oil of the Atlas cedar ( Cedrus Atlantica ). The mol­ecule contains fused six-, seven- and two three-membered rings. The six-membered ring has a half-chair conformation, while the seven-membered ring displays a boat conformation. The absolute structure was unambiguously established from anomalous dispersion effects. The crystal packing exhibits no short inter­molecular contacts.

acta crystallographica. section e

(1S,3R,8R,9S,11R)-2,2-Dibromo-10,10-dichloro-3,7,7,11-tetramethyltetracyclo[6.5.0.01,3.09,11]tridecane