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In the title compound, C14H14N2O2S, a novel sulfonamide derivative, an intramolecular C—H...O hydrogen bond generates an S(5) ring motif. The molecule adopts a twisted E configuration around the C=N bond. An intermolecular N—H...O hydrogen bond generates an R22(8) ring motif. The dihedral angle between the rings is 85.37 (9)°. The H atoms of the methyl group have rotational disorder with refined site occupancies of ca 0.63/0.37. In the crystal structure, intermolecular N—H...O hydrogen bonds link neighbouring molecules into dimers which stack along the a axis with a centroid–centroid distance of 3.8856 (10) Å.