Diethyl [(5-chloro-2-hydroxyanilino)(4-chlorophenyl)methyl]phosphonate

In the title compound, C17H20Cl2NO4P, the P atom is bonded in a distorted tetrahedral environment. The dihedral angle between the two benzene rings is 80.5 (1)°. In the crystal structure, intermolecular O—H...O and N—H...O hydrogen bonds link pairs of molecules into centrosymmetric dimers. These dimers, are in turn, linked by weak intermolecular C—H...O hydrogen bonds into one-dimensional chains along [010]. Additional stabilization is provided by very weak C—H...Cl interactions.