4-Methyl-3-phenyl-2,4-dihydro­pyrazolo­[4,3-c][1,2]benzothia­zine 5,5-dioxide

In the title mol­ecule, C₁₆H₁₃N₃O₂S, the heterocyclic thia­zine ring adopts a twist chair conformation with the S atom and an adjacent C atom displaced by 0.946 (5) and 0.405 (6) Å, respectively, on the same side of the mean plane formed by the remaining ring atoms. The mean planes of the benzene rings make dihedral angles of 16.61 (10) and 15.32 (10)° with the mean plane of the pyrazole ring. The mol­ecular structure is consolidated by intra­molecular C—H...N inter­actions and the crystal packing is stabilized by N—H...O and C—H...N hydrogen bonds. The crystal studied was an inversion twin with the refined ratio of the twin components being 0.53 (11):0.47 (11).

Propan-2-yl 2-(1,1,3-trioxo-2,3-dihydro-1λ⁶,2-benzothia­zol-2-yl)acetate

In the title mol­ecule, C₁₂H₁₃NO₅S, the benzisothia­zole ring system is essentially planar (r.m.s. deviation = 0.0169 Å) as is the –C—C(=O)—O—C– sequence of atoms in the vicinity of the acetate group (r.m.s. deviation = 0.0044 Å). The mean plane of these atoms forms a dihedral angle of 88.41 (7)° with the benzisothia­zole ring system. In the crystal, weak C—H...O hydrogen bonds involving methyl­ene and methyne H atoms form R₄³(20) graph-set motifs.