(1S,2R,7R,8S,10R)-9,9-Di­bromo-2,6,6,10-tetra­methyl-1α,2α-ep­oxy­tri­cyclo­[5.5.0.0(8,10)]dodeca­ne

The title compound, C(16)H(24)Br(2)O, was synthesized from the reaction of β-himachalene (3,5,5,9-tetra­methyl-2,4a,5,6,7,8-hexa­hydro-1H-benzo­cyclo­heptene), which was isolated from Atlas cedar (Cedrus atlantica) essential oil, after reaction with di­bromo­carbene. The asymmetric unit contains two independent mol­ecules with similar conformations. Each mol­ecule is built up from fused six-and seven-membered rings and two three-membered rings. In both mol­ecules, the six-membered ring has an envelope conformation with the flap provided by the C atom of the ep­oxy ring, whereas the seven-membered ring displays a chair conformation. The crystal packing is governed only by van der Waals inter­actions. The absolute configuration was established from anomalous dispersion effects.