Crystal structure of diethyl [(4-nitro­phenyl­amino)(2-hy­droxy­phen­yl)meth­yl]phospho­nate methanol monosolvate

In the title compound, C₁₇H₂₁N₂O₆P·CH₃OH, the planes of the 4-nitro­aniline and 2-hy­droxy­phenyl groups form a dihedral angle of 84.04 (8)°. The P atom exhibits tetra­hedral geometry involving two O-ethyl groups, a Cα atom and a double-bonded O atom. In the crystal, O—H...O, N—H...O and C—H...O hydrogen bonds link the α-amino­phospho­nic acid and methanol mol­ecules into chains that propagate parallel to the a axis.