2-Ethyl 3,4-dimethyl 4′-methyl­biphenyl-2,3,4-tricarboxyl­ate

In the title compound, C₂₀H₂₀O₆, the biphenyl twist angle is 48.2 (1)°. All three ester groups are planar and they make dihedral angles of 63.6 (1), 56.8 (1) and 41.6 (1)° with the attached benzene ring. C—H...O inter­actions contribute to both mol­ecular and crystal stability.