4,4′-Oxydibenzoic acid

In the title compound, C14H10O5, each carboxyl group is coplanar with the attached aromatic ring. The dihedral angle between these planes is 72.56 (5)°. The carboxyl groups are linked by a pair of centrosymmetric O—H⋯O hydrogen bonds, creating a zigzag chain along the [2\overline{3}1] direction.