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The syntheses and crystal structures of the isomeric 4-bromo- N -[(2-nitro-phen-yl)sulfon-yl]benzamide, (I), and 4-bromo- N -[(4-nitro-phen-yl)sulfon-yl]benzamide, (II), are described (mol-ecular formula = C 13 H 9 BrN 2 O 5 S in each case). The asymmetric unit of (I) contains two independent mol-ecules [(I A ) and (I B )], while that of (II) contains one mol-ecule. The benzoic acid aromatic ring of mol-ecule (I A ) is disordered due to rotation about the C ar -C(=O) bond over two orientations in a 0.525 (9):0.475 (9) ratio. The dihedral angle between the benzene rings is 85.9 (3)° in (I A ) and 65.22 (19)° in (I B ), while in (II), the corresponding value is 56.7 (7)°. In the crystals of (I) and (II), N-H⋯O, C-H⋯O and C-H⋯π inter-actions generate three-dimensional networks.

Crystal structures of isomeric 4-bromo-N-[(2-nitrophenyl)sulfonyl]benzamide and 4-bromo-N-[(4-nitrophenyl)sulfonyl]benzamide