2-Carboxy-anilinium chloride monohydrate.

In the mol-ecule of the title compound, C(7)H(8)NO(2) (+)·Cl(-)·H(2)O, an intra-molecular N-H⋯O hydrogen bond results in the formation of a non-planar six-membered ring adopting a flattened boat conformation. In the crystal structure, inter-molecular O-H⋯O and N-H⋯Cl hydrogen bonds link the mol-ecules. There is a C=O⋯π contact between the carbonyl unit and the centroid of the benzene ring. There is a C=O⋯π contact [C⋯Cg = 3.5802 (18), C-O⋯Cg = 89 (1)°] between the carbonyl unit and the centroid of the benzene ring.

(2E)-3-(4-Chloro-phen-yl)-1-(1H-pyrrol-2-yl)prop-2-en-1-one.

In the mol-ecule of the title compound, C(13)H(10)ClNO, the benzene and pyrrole rings are oriented at a dihedral angle of 7.37 (12)°. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric R(2) (2)(10) dimers. There are C-H⋯π inter-actions between benzene and pyrrole rings and a benzene C-H group. A weak π-π inter-action between the pyrrole rings [centroid-centroid distance 3.8515 (11) Å] further stabilizes the structure. There is also a π inter-action between the pyrrole ring and the carbonyl group, with a carbon-centroid distance of 3.4825 (18) Å.

4-(4-Fluoro-phen-yl)-6-(2-fur-yl)pyrimidin-2-amine.

Mol-ecules of the title compound, C(14)H(10)FN(3)O, are essentially planar and in the crystal structure they form dimers via hydrogen bonds, involving pyrimidinyl N atoms and amino H atoms, about inversion centers. The centroids of the furyl and pyrimidinyl rings are separated by 3.489 (2)Å, indicating π-π stacking inter-actions.