Abstract
The title compound, C14H18N2O4S, contains hydrogen-bonded dimeric pairs of molecules arranged around inversion centers, forming 14-membered rings with an R-2(2)(14) motif. The structure is stabilized by extensive intramolecular interactions. The thiazine ring adopts a half-chair conformation, with the S and N atoms displaced by -0.485 (3) and 0.296 (3) angstrom, respectively, from the plane formed by the remaining atoms of the ring.