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In the title phospho­nate, C 19 H 21 O 9 P, 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.

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