Abstract
In the crystal structure of the title molecule, C13H15NO5S, the S and N atoms of the thiazine ring exihibit the maximum deviations from the least-squares plane of 0.3008 (6) and 0.3280 (7) angstrom, respectively. The ring therefore adopts a half chair conformation. The thiazine ring is twisted by an angle of 13.29 (7)degrees with respect to the aromatic ring. The isopropyl substituent is oriented at a dihedral angle of 53.2 (12)degrees with respect to the thiazine ring. An intramolecular O-H center dot center dot center dot O hydrogen bond occurs. Intermolecular hydrogen bonding is observed in the crystal structure.