Mol-ecular and crystal structure of (1R,3R,4S,7R)-3-bromo-7-(bromo-meth-yl)-1,7-dimethyl-3-nitro-bi-cyclo-[2.2.1]heptan-2-one.

The bicyclic title compound, C10H13Br2NO3, is a camphor derivative, crystallizing in the Sohncke space group P212121, and the absolute configurations of its four chiral C atoms were unambiguously determined. The relative configuration of a bridgehead carbon atom was also confirmed by one- and two-dimensional NMR experiments. In the extended structure, weak C-H⋯O, C-H⋯Br and halogen bonds of the type Br⋯O consolidate the packing.