Abstract
In the title compound, C21H21N5O4S center dot 0.5C(3)H(7)NO, the heterocyclic thiazine ring adopts a half-chair conformation, with the S and N atoms displaced by -0.451 (5) and 0.233 (5) angstrom, respectively, from the plane formed by the remaining ring atoms. The asymmetric unit contains a disordered halfmolecule of solvent lying close to inversion centers. The crystal structure is stabilized by weak intermolecular N-H center dot center dot center dot O and C-H center dot center dot center dot O interactions.