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The title compound, C(14)H(13)NO(3)S, (I), is a second monoclinic polymorph. The original polymorph, (II), was reported by Mahía et al. [Acta Cryst. (1999), C55, 2158-2160]. Polymorph (II) crystalllized in the space group P2(1)/c (Z = 4), whereas the title polymorph (I) occurs in the space group P2(1)/n (Z = 4). The dihedral angle between the two aromatic rings is 75.9 (1)° in (I) compared to 81.9 (1)° for (II). In both polymorphs, two S(6) rings are generated by intra-molecular N-H⋯O and C-H⋯O hydrogen bonds, resulting in similar mol-ecular geometries. However, the two polymorphs differ concerning their crystal packing. In (I), mol-ecules are linked into C(8) zigzag chains along the b axis by C-H⋯O hydrogen bonds, whereas in (II) mol-ecules are linked by C-H⋯O hydrogen bonds, forming C(7) chains along the b axis. The title polymorph is further stabilized by inter-molecular C-H⋯π and π-π inter-actions [centroid-centroid distance = 3.814 (1) Å]. These inter-actions are not evident in polymorph (II).

N-(2-Formylphenyl)-4-toluenesulfonamide: a second monoclinic polymorph