The title compound, C(28)H(16)N(2)O(5), is a bis-imide derivative in which two phthalimide units are linked by an oxydi-p-phenyl-ene bridge. The dihedral angle between the planes of the two central benzene rings is 86.1 (4)°. The isoindole groups make dihedral angles of 46.0 (14) and 77.5 (13)° with the attached benzene rings. Inter-molecular C-H⋯O hydrogen bonds contribute to the stability of the structure.