4,4′-[(5-Carboxy-1,3-phenylene)bis(oxy)]dibenzoic acid

Abstract

In the title compound, C21H14O8, the central benzene ring makes dihedral angles of 77.8 (6) and 75.9 (5)° with the outer benzene rings. In the crystal, molecules are linked by O—H...O hydrogen bonds involving carboxyl groups, forming one-dimensional ladders. Two-dimensional layers are formed by interpenetration of these one-dimensional ladders.