Experimental Crystal data

R factor = 0.037; wR factor = 0.104; data-to-parameter ratio = 12.7. In the title compound, C9H13NO2S, the mean planes of thiophene ring [maximum deviation = 0.0042 (10) Å] and ethoxycarbonyl group [0.0242 (15) Å] are almost coplanar [dihedral angle between them = 0.68 (11)]. The H atoms of the two methyl groups attached to the thiophene ring are each disordered over two orientations with site-occupancy ratios of 0.77 (4):0.23 (4) and 0.84 (4):0.16 (4). An intramolecular N— H O hydrogen bond generates an S(6) ring motif. In the crystal, molecules are linked by N—H O hydrogen bonds into an infinite wave-like chain running parallel to the b-axis direction. The crystal structure also features C—H interactions. Related literature For the synthesis, see: Gewald (1965). For background t