S,S'-(Pyridazine-3,6-di-yl)dithio-uronium dichloride methanol monosolvate.

In the title compound, C(6)H(10)N(6)S(2) (2+)·2Cl(-)·CH(3)OH, the pyrid-azine ring is almost planar, the greatest deviation from the mean plane being 0.025 (2) Å for one of the ring N atoms. The two thiouronium substituents are tilted out of this plane by 60.87 (6) and 57.94 (7)°. The thiouronium cations and the chloride anions are linked by strong N-H⋯Cl hydrogen bonds. The methanol solvent mol-ecule inter-acts with both the chloride ion (through an O-H⋯Cl hydrogen bond) and the cation (through an N-H⋯O hydrogen bond), resulting in a three-dimensional supra-molecular arrangement.