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The title mol­ecule, C 22 H 22 O 4 , is centrosymmetric with an inversion centre located at the centre of the benzene ring. The 3,4-dimeth­oxy­benzene fragment is essentially planar [maximum deviation = 0.400 (2) Å] and twisted relative to the central benzene ring, forming a dihedral angle of 21.25 (7)°. In the crystal, C—H⋯O hydrogen bonds link the mol­ecules into a two-dimensional polymeric structure lying parallel to (100).

3,3′′,4,4′′-Tetramethoxy-1,1′:4′,1′′-terphenyl