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)°]. The six-membered 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)° in one mol­ecule, and 77.8 (2) and 82.9 (2)° in the other]. In the crystal, mol­ecules are linked by C—H...N and C—H...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).

(2Z)-2-Benzyl­idene-4-n-butyl-3,4-di­hydro-2H-1,4-benzo­thia­zin-3-one

In the title compound, C₁₉H₁₉NOS, the six-membered hetero­cyclic ring of the benzo­thia­zine fragment exhibits a screw boat conformation. The plane of the fused benzene ring makes a dihedral angle of 72.38 (12)° with that of the terminal phenyl ring, and is nearly perpendicular to the mean plane formed by the atoms through the n-butyl chain, as indicated by the dihedral angle of 88.1 (2)°. In the crystal, mol­ecules are linked by C—H...O inter­actions to form supra­molecular chains along [110].

Crystal structure of 1-ethyl­pyrazolo[3,4-d]pyrimidine-4(5H)-thione

In the title compound, C₇H₈N₄S, the methyl C atom is displaced by 1.232 (7) Å from the mean plane of the pyrazolo­[3,4-d]pyrimidine ring system (r.m.s. deviation = 0.007 Å). The N—N—C—C_m (m = meth­yl) torsion angle is −60.3 (6)°. In the crystal, mol­ecules are linked by N—H...S hydrogen bonds, generating [010] chains, which are reinforced by C—H...N inter­actions. The chains are cross-linked by weak C—H...S hydrogen bonds, generating (001) sheets.