(1S,3R,8R,11S)-11-Bromo-10-bromo­methyl-2,2-di­chloro-3,7,7-tri­methyl­tricyclo­[6.4.0.0(1,3)]dodec-9-ene

The title compound, C(16)H(22)Br(2)Cl(2), was synthesized from β-him­achalene (3,5,5,9-tetra­methyl-2,4a,5,6,7,8-hexa­hydro-1H-benzo­cyclo­heptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The mol­ecule is built up from fused six- and seven-membered rings and an appended three-membered ring. The six-membered ring has a half-chair conformation, whereas the seven-membered ring displays a chair conformation. The dihedral angle between the two best plane through each ring is 59.5 (2)°. No specific inter­molecular inter­actions were discerned in the crystal packing.