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In the molecule of the title compound, C11H14N2O2S, the five-membered ring adopts an envelope conformation and an intramolecular N—H...O hydrogen bond occurs. Intramolecular N—H...O, C—H...S and C—H...N hydrogen bonds result in the formation of two five- and one six-membered rings, having twisted conformations. In the crystal structure, intermolecular N—H...O, N—H...S and C—H...S hydrogen bonds link the molecules, forming polymeric sheets. The π–π contacts between the isoindole ring systems, [centroid–centroid distances = 3.5883 (8) and 4.0619 (8) Å] may further stabilize the structure. A C—H...π interactions also occur.