O-butyl S-(1,1,3-trioxobenz[d]isothiazol-2-yl)methyl dithiocarbonate

The asymmetric unit in the crystal structure of the title compound, C13H15NO4S3, comprises two molecules. Their nine-membered fused- ring systems are planar, with maximum deviations from the mean planes for the N atoms of 0.045 (3) and -0.028 (3) angstrom for the two molecules. The molecules are linked by intermolecular C-H center dot center dot center dot O hydrogen bonds oriented along the [010] axis