Ethyl (3E)-3-[2-(4-bromo­phenyl­sulfon­yl)hydrazin-1-yl­idene]butano­ate

The asymmetric unit of title compound, C₁₂H₁₅BrN₂O₄S, contains two mol­ecules (A and B), with slightly different conformations: the bromo­phenyl rings and the SO₂ planes of the sulfonyl groups are oriented at dihedral angles of 50.2 (2) (mol­ecule A) and 58.24 (7)° (mol­ecule B), and the ethyl acetate groups make dihedral angles of 63.99 (19)° (A) and 65.35 (16)° (B) with their bromo­phenyl groups. In the crystal, both mol­ecules exist as inversion dimers linked by pairs of N—H...O hydrogen bonds, which generate R₂²(14) loops. The dimers are linked by C—H...O inter­actions.

2-[(2-Amino­phen­yl)sulfan­yl]-N-(4-meth­oxy­phen­yl)acetamide

In the title compound, C₁₅H₁₆N₂O₂S, the dihedral angle between the 4-meth­oxy­aniline and 2-amino­benzene­thiole fragments is 35.60 (9)°. A short intra­molecular N—H...S contact leads to an S(5) ring. In the crystal, mol­ecules are consolidated in the form of polymeric chains along [010] as a result of N—H...O hydrogen bonds, which generate R₃²(18) and R₄³(22) loops. The polymeric chains are interlinked through C—H...O inter­action and complete R₂²(8) ring motifs.

5-Methyl-1-[(4-methyl­phen­yl)sulfon­yl]-1H-pyrazol-3-yl 4-methyl­benzene­sulfonate

In the title compound, C₁₈H₁₈N₂O₅S₂, the tolyl rings are oriented at a dihedral angle of 16.15 (11)° with respect to one another. The 5-methyl-1H-pyrazol-3-ol ring is roughly planar (r.m.s. deviation = 0.0231 Å) and subtends angles of 73.82 (8) and 89.85 (8)° with the tolyl rings. In the crystal, very weak π–π inter­actions between tolyl groups, with centroid–centroid distances of 4.1364 (19) and 4.0630 (16) Å, together with a C—H...π contact generate a three-dimensional network.