(E)-2-{[(2-(Trifluoro-meth-yl)phen-yl]imino-meth-yl}phenol.

In the crystal of the title compound, C(14)H(10)F(3)NO, intra-molecular O-H⋯N and O-H⋯F hydrogen bonds generate S(6) and S(10) intramolecular hydrogen-bonded rings. The dihedral angle between the planes of the aromatic rings is 13.00 (14)°.

2-Amino-3-(hy-droxy-meth-yl)pyridinium 2-benzoyl-benzoate monohydrate.

In the title hydrated salt, C(6)H(9)N(2)O(+)·C(14)H(9)O(3) (-)·H(2)O, the dihedral angle between the benzene rings of the 2-benzoyl-benzoate anion is 82.04 (14)°, while the angles between the aromatic ring of the pyridinium cation and each of the benzene rings of the anion are 4.42 (14) and 82.04 (14)°. In the crystal, mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds, generating a three-dimensional network with R(2) (2)(8), R(6) (6)(16) and R(4) (4)(6) motifs. The crystal packing is further stabilized by two π-π inter-actions, one between pyridinium rings, and another between the benzene benzoate and pyridinium rings of neighbouring mol-ecules, with centroid-to-centroid distances of 3.559 (2) and 3.606 (2) Å, respectively.

2-Amino-5-nitro-benzoic acid.

In the title compound, C(7)H(6)N(2)O(4), an intra-molecular N-H⋯O hydrogen bond generates an S(6) ring. In the crystal, inversion dimers linked by pairs of O-H⋯O hydrogen bonds generate R(2) (2)(8) loops. Inter-molecular N-H⋯O and C-H⋯O hydrogen bonds then link the dimers, generating R(3) (3)(16)R(2) (1)(6) motifs. The whole mol-ecule is essentially planar, with the greatest deviation from the mean plane being 0.065 (2) Å.