Abstract
In the title compound, C9H11N3O2S, the thiazine ring adopts a half-chair conformation. In the crystal structure N-H center dot center dot center dot N hydrogen bonds connect two molecules into a centrosymmetric dimer, forming an R-2(2)(6) ring motif. These dimers are further connected into chains by N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds.