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In the title compound, C9H11Cl2N3O4S2, systematic name 6-chloro-3-chloro­methyl-3,4-dihydro-2-methyl-7-sulfamoyl-1,2,4-benzothia­diazine 1,1-dioxide, three kinds of N—H⋯O hydrogen bond generate a sheet structure. The combination of four N—H⋯O hydrogen bonds yields an R44(26) ring, with adjacent rings linked into two-dimensional layers parallel to the (001) plane. Pairs of adjacent planes are further connected by N—H⋯O hydrogen bonds.