In the title compound, C9H10N4O2·H2O, the oxime unit has an E configuration, and an intra­molecular N—H⋯N hydrogen bond results in the formation of a planar five-membered ring, which is oriented with respect to the aromatic ring at a dihedral angle of 74.82 (17)°. In the crystal structure, inter­molecular O—H⋯O and N—H⋯O hydrogen bonds link the mol­ecules and R 2 2(8) ring motifs are apparent.

The title compound, C16H17NOS2, consists of a carbazole skeleton with tetra­hydro­furan and dithiol­ane rings. In the indole ring system, the benzene and pyrrole rings are nearly coplanar, forming a dihedral angle of 1.57 (15)°. The cyclo­hexenone and tetra­hydro­furan rings have envelope conformations, while the dithiol­ane ring adopts a twist conformation. In the crystal structure, pairs of weak inter­molecular N—H⋯S hydrogen bonds link the mol­ecules into centrosymmetric dimers with R 2 2(16) ring motifs. Weak C—H⋯π inter­actions may further stabilize the structure.

The title compound, [Zn(C7H4BrO2)2(C10H14N2O)2(H2O)2], is a monomeric complex with the ZnII atom lying on an inversion center. It contains two 4-bromo­benzoate, two diethyl­nicotinamide ligands and two water mol­ecules, all of which are monodentate. The four O atoms in the equatorial plane around the Zn atom form a slightly distorted square-planar arrangement, while the distorted octa­hedral geometry is completed by two N atoms in the axial positions. The methyl group of one of the ethyl groups is disordered over two positions, with occupancies of ca 0.65 and 0.35. The two aromatic rings are oriented at an angle of 77.22 (14)°. In the crystal structure, O—H⋯O hydrogen bonds link the mol­ecules into chains along the a axis.

In the mol­ecule of the title compound, C14H13NO2, the two aromatic rings are oriented at a dihedral angle of 0.78 (20)°; with the exception of two methyl H atoms the mol­ecule is essentially planar. The intra­molecular O—H⋯N hydrogen bond results in the formation of a non-planar, six-membered ring, which adopts a flattened-boat conformation. In the crystal structure, inter­molecular C—H⋯O hydrogen bonds link the mol­ecules to form parallel networks. There is a C—H⋯π contact between the methyl group and the benzene ring. A π–π contact between the benzene and phenyl rings [centroid–centroid distance = 4.681 (5) Å] is also observed.