2-(4-Chloro-benzo-yl)-1-(diamino-methyl-ene)hydrazinium chloride monohydrate.

In the cation of the title compound, C(8)H(10)ClN(4)O(+)·Cl(-)·H(2)O, the guanidinium group is planar (maximum deviation = 0.0001†à ) and nearly perpendicular to carboxamide group, making a dihedral angle of 87.0†(3)°. The N atoms of the guanidine fragment have a planar trigonal configuration and the N atom of the carboxamide group adopts a pyramidal configuration. In the crystal structure, inter-molecular N-H⋯O, N-H⋯Cl and O-H⋯Cl hydrogen bonds link the cations, anions and water mol-ecules into layers parallel to the bc plane.