4-[(2E)-2-(4-Chlorobenzylidene)hydrazinylidene]-1-methyl-1, 4-dihydro-pyridine monohydrate

In the title compound, C13H12ClN3· H2O, the organic mol-ecule is almost planar, with a dihedral angle of 3.22 (10)° between the benzene and pyridine rings. The crystal structure is stabilized by O - H?N and C - H?O hydrogen bonding and ?-? stacking inter-actions [centroid-centroid distances = 3.630 (1) and 3.701 (1) Å].