4-[(1-Benzyl-1,2,3-triazol-5-yl) methyl]-2H-1,4-benzothiazin-3(4H)-one

The asymmetric unit of the title compound, C18H16N4OS, contains two independent molecules of similar conformation, the most relevant difference being the dihedral angle formed by the benzene rings [57.8 (2) and 52.7 (2)degrees]. The sixmembered heterocycle of the benzothiazine fragment exhibits a screw-boat conformation in both molecules. The plane through the triazole ring is nearly perpendicular to those through the fused and terminal benzene rings [dihedral angles of 74.2 (2) and 83.2 (2)degrees in one molecule, and 77.8 (2) and 82.9 (2)degrees in the other]. In the crystal, molecules are linked by C-H center dot center dot center dot N and C-H center dot center dot center dot O hydrogen bonds into chains parallel to the a-axis direction. The crystal used was a non-merohedral twin, the refined ratio of twin components being 0.85 (10): 15 (10).