Bis[5-meth­oxy-2-(meth­oxy­carbon­yl)phen­yl] methyl­phospho­nate

In the title phospho­nate, C₁₉H₂₁O₉P, the dihedral angle between the benzene rings is 63.33 (3)°, and the P atom has a distorted tetra­hedral geometry, with angles in the range 101.30 (6)–120.38 (6)°. No significant inter­molecular inter­actions are observed in the crystal structure, and π–π inter­actions between symmetry-related benzene rings are beyond 4 Å.