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In the title molecular salt, (C10H16N)2[CuBr4], the CuII ion adopts a squashed tetrahedral geometry with Br—Cu—Br angles varying between 99.29 (3) and 132.53 (3)°. In the crystal, the components are linked by C—H...Br interactions, thereby generating a three-dimensional network.

The title molecule, C14H19NO6, was synthesized by the reaction of glyoxylic acid, ethyl acetoacetate and NH4HCO3. In the crystal structure, the dihydropyridine ring adopts an asymmetric boat-type conformation with the C atom bearing the carboxyl group showing a signficantly larger deviation [0.325 (2) Å] from the base plane then the N atom [0.137 (2) Å]. One of the ethyl groups is disordered over two positions with occupancies of 0.741 (10) and 0.259 (10). The crystal is stabilized by strong intermolecular hydrogen bonds. N—H...O interactions form infinite chains in the a direction. O—H...O hydrogen bonds form typical carboxylic acid dimers, which link the N—H...O chains into a ladder-type double chain.

In the title compound, C(13)H(9)N(3)O(2)·C(3)H(7)NO, the benzimidazole ring system and the benzene ring are essentially coplanar, forming a dihedral angle of 0.86 (5)°. The crystal packing is stabilized by an inter-molecular N-H⋯O hydrogen bond and a π-π stacking inter-action with a centroid-centroid separation of 3.685 (4) Å.