2-Phenyl-biguanidinium hydrogen succinate methanol monosolvate.

In the crystal of the title compound, C(8)H(12)N(5) (+)·C(4)H(5)O(4) (-)·CH(3)OH, the hydrogen succinate anions form infinite [010] chains via short, almost symmetrical, O⋯H⋯O hydrogen bonds. The 2-phenyl-biguanidium cations inter-connect these chains into layers lying parallel to the bc plane by way of N-H⋯O links. These planes only weakly inter-act in the direction of the a axis via C-H⋯π contacts between offset phenyl rings, leaving as much as 17% of the unit-cell volume accessible for the solvent. However, the methanol solvent mol-ecules could not be resolved due to extensive disorder and their assumed presence was removed from the overall scattering by the PLATON SQUEEZE procedure.