In the title hydrate, C19H26ClN3O4·H2O, the imidazole ring is nearly perpendicular [dihedral angle = 89.5 (1)°] to the dihydropyridine moiety. The propyl and one of the ethyl groups are disordered over two resolved sets of sites [occupancy factors 0.524 (8):0.476 (8) and 0.640 (16):0.360 (16), respectively]. In the crystal, a three-dimensional network is constructed by O—H...O, N—H...O and N—H...N hydrogen bonds involving both the main molecule and the water molecule of crystallization, as well as C—H...π(ring) interactions.
