Butyl 4-(4-methyl-benzene-sulfonamido)-benzoate.

In the title compound, C(18)H(21)NO(4)S, the aromatic rings are almost normal to each other, with a dihedral angle of 89.27 (18)°. The mol-ecular conformation is stabilized by an intra-molecular C-H⋯O inter-action, which generates an S(6) motif. In the crystal, N-H⋯O and C-H⋯O hydrogen bonds lead to the formation of chains propagating along [010]. Neighbouring chains are linked via a C-H⋯π inter-action. The -CH(2)CH(2)CH(3) atoms of the butyl group are disordered over two sets of sites, with a refined site-occupancy ratio of 0.536 (16):0.464 (16).