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In the title compound, C6H6Cl2N2O2S, the O atoms of the sulfonamide group lie on one side of the benzene ring and the amino group lies on the opposite side. An intermolecular N—H...Cl interaction occurs. In the crystal, adjacent molecules are linked by N—H...O hydrogen bonds, forming a three-dimensional structure with supporting π–π stacking interactions [centroid–centroid distance = 3.7903 (12) Å]. A short Cl...Cl contact [3.3177 (10) Å] also occurs.