N-(4-Chloro-2-nitro-phen-yl)methane-sulfonamide.

The title compound, C7H7ClN2O4S, is of inter­est as a precursor to biologically active substituted quinolines. Its structure resembles those of the previously reported N-phenyl­methane sulfonamide and its 4-nitro, 4-fluoro and 4-bromo derivatives, with slightly different geometric parameters. An intra­molecular N—H⋯O hydrogen bond gives rise to a six-membered ring. Inter­molecular C—H⋯O contacts stabilize the crystal packing.