Ethyl [(2-hydroxy-phen-yl)(pyridinium-2-ylamino)meth-yl]phospho-nate methanol solvate.

In the title compound, C(14)H(17)N(2)O(4)P·CH(3)OH, the planes of the pyridinium-2-ylamino and 2-hydroxy-phenyl groups form a dihedral angle of 75.6 (1)°, with the pyridinium NH group and the 2-hydroxy-phenyl OH group pointing in opposite directions. Three intra-molecular hydrogen bonds are observed. Two phospho-nate and two methanol mol-ecules are connected by O-H⋯O hydrogen bonds as a centrosymmetric dimeric cluster, and inter-act further with other dimeric clusters via N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds and C-H⋯π inter-actions, resulting in a sheet structure.