Abstract
In the title compound, C16H13Cl2N3O2S, the dihedral angle between the aromatic rings is 6.62 (2)degrees and the C=N-N=C torsion angle is 176.2 (4)degrees. The thiazine ring shows an envelope conformation, with the S atom displaced by 0.633 (6)degrees from the mean plane of the other five atoms (r.m.s. deviation = 0.037 angstrom). The Cl atom is an an axial conformation and is displaced by 2.015 (6) angstrom from the thiazine ring plane. In the crystal, molecules are linked by C-H center dot center dot center dot O interactions, generating a three- dimensional network. Very weak aromatic pi-pi stacking interactions [centroid- centroid separations = 3.928 (2) angstrom] are also observed.