organic compounds
The title compound, C8H12Br4, displays crystallographic inversion symmetry, so that the cyclobutane ring is exactly planar. The ring C—C bond with eclipsed substituents is lengthened somewhat to 1.572 (5) Å. The packing can be described in terms of three BrBr contacts; two of these combine to form layers of molecules parallel to the ac plane, while the third crosslinks the layers in the third dimension. A simple topological descriptor for systems involving BrBr contacts is proposed.