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In the title compound, C13H14N4O2S, the dihedral angle between the aromatic rings is 55.42 (14)°. In the crystal structure, an N—H...O hydrogen bond leads to chains of molecules along [001].

In the title compound, C17H21N3O3S, the dihedral angle between the aromatic ring planes is 84.2 (2)°. The pendant ethyl groups of the –N(C2H5)2 group are disordered over two sets of positions in a 0.84 (2):0.16 (2) ratio. The molecular conformation is stabilized by an intramolecular O—H...N hydrogen bond, and intermolecular N—H...O bonds lead to [010] chains in the crystal structure.

In the cation of the title compound, [Co(H2O)6](C13H10NO4S)2, the Co atom lies on a centre of symmetry and its coordination geometry is octahedral. The crystal structure is stabilized by water–anion O—H...O hydrogen bonds. An intramolecular O—H...N hydrogen bond occurs in the anion.

There are two molecules in the asymmetric unit of the title compound, C15H16N2O4S, both of which are stabilized by an intramolecular O—H...N hydrogen bond. Intermolecular N—H...O hydrogen bonds lead to [101] chains of molecules in the crystal structure.

In the title fused-ring compound, C12H13NO3, the two five-membered C3NO rings both approximate to envelope conformations with C atoms in the flap positions. The OH group of the pendant CH2OH unit is disordered over two positions in a 0.528 (5):0.472 (5) ratio. One of the OH groups participates in an O—H...N hydrogen bond, generating centrosymmetric dimers in the crystal structure.