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The title compound, C 18 H 14 Cl 2 N 2 O 4 S 2 , is a diamine that is a precursor to a quinonoid bidentate redox-active ligand. The dihedral angles between the central phenyl ring and the end rings are 87.5(1) and 60.7(1)°, while the two end rings make a dihedral angle of 82.5(1)°. The crystal structure is stabilized by two weak inter­molecular N—H⋯O hydrogen bonds, as well as one intra­molecular C—H⋯O and one N—H⋯N hydrogen bond.

4,4′-Dichloro-N,N′-(o-phenylene)dibenzenesulfonamide