2-{[2-(1-Methyl-2,2-dioxo-3,4-dihydro-1H-2λ⁶,1-benzothia­zin-4-yl­idene)hydrazin-1-yl­idene]meth­yl}phenol

In the title compound, C₁₆H₁₅N₃O₃S, the dihedral angle between the aromatic rings is 8.18 (11)° and the C=N—N=C torsion angle is 178.59 (14)°. The conformation of the thia­zine ring is an envelope, with the S atom displaced by 0.8157 (18) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.045 Å). An intra­molecular O—H...N hydrogen bond closes an S(6) ring. In the crystal, weak C—H...O inter­actions link the mol­ecules, with all three O atoms acting as acceptors.

6-Bromo-1-methyl-4-[2-(4-nitro­benzyl­idene)hydrazin-1-yl­idene]-2,2-dioxo-3,4-dihydro-1H-2λ⁶,1-benzothia­zine

In the title compound, C₁₆H₁₃BrN₄O₄S, the dihedral angle between the aromatic rings is 4.1 (2)° and the C=N—N=C torsion angle is 175.5 (3)°. The nitro group is almost coplanar with the benzene ring to which it is attached [dihedral angle = 2.9 (7)°]. The thia­zine ring has an S-envelope conformation with the S atom displaced by 0.819 (3) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.017 Å). In the crystal, C—H...O inter­actions link the mol­ecules and weak aromatic π–π stacking [centroid–centroid separation = 3.874 (2) Å] is also observed.

2,5-Dichloro-N-(2,3-dimethyl­phen­yl)benzene­sulfonamide

In the title compound, C₁₄H₁₃Cl₂NO₂S, the dihedral angle between the aromatic rings is 62.21 (7)° and the C—S—N—C group adopts a gauche conformation [torsion angle = 60.22 (17)°]. In the crystal, N—H...O hydrogen bonds link the mol­ecules into C(4) chains propagating in [010]. A short inter­molecular Cl...O contact of 3.1115 (17) Å is seen.