In the title mol-ecule, C(24)H(18)ClNO(6)S, the heterocyclic thia-zine ring adopts a half chair conformation with the S and N atoms displaced by 0.318 (3) and 0.387 (3) Å, respectively, on the opposite sides from the mean plane formed by the remaining ring atoms. The benzene rings of the benzothia-zin unit and meth-oxy-benzoyl group are more or less coplanar, the dihedral angle between the mean planes of these rings being 12.37 (10)° while the chloro-phenyl ring is inclined at 81.87 (4) and 73.30 (5)°, respectively, to these rings. The mol-ecular structure is consolidated by intra-molecular O-H⋯O and C-H⋯N inter-actions and the crystal packing is stabilized by weak inter-molecular C-H⋯O hydrogen bonds.