2,2′-[2,3,5,6-Tetra­methyl-p-phenyl­enebis­(methyl­eneoxy)]dibenzoic acid

The asymmetric unit of the title compound, C(26)H(26)O(6), contains only a half-mol­ecule, the other half being generated by an inversion center. The two carboxy­phenoxy­methyl units occupy the 1,4-positions of the central aromatic ring. The central ring and the six linked C atoms are almost planar, with a maximum deviation of 0.0286 (17) Å, and the plane makes a dihedral angle of 75.50 (6)° with the benzene ring. In the crystal, strong O—H⋯O hydrogen bonds between the carboxyl groups of adjacent mol­ecules and C—H⋯π inter­actions link the mol­ecules into zigzag chains along (220) and ([Image: see text]10); the two types of chain are arranged alternately, forming a three-dimensional framework.