The mol-ecular conformation of the title compound, C(18)H(18)N(2)O(3)S, is stabilized by an intra-molecular N-H⋯O hydrogen bond. The crystal packing shows centrosymmetric dimers connected by N-H⋯S hydrogen bonds. The terminal eth-oxy substituents are statistically disordered [occupancy ratio 0.527 (5):0.473 (5)].