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In the mol­ecule of the title compound, C 20 H 16 N 2 O 5 , the phthalimide fragments are almost planar, with r.m.s. deviations of 0.018 and 0.020 Å, and make a dihedral angle of 53.64 (3)°. The mol­ecular and crystal structures are stabilized by a weak inter­molecular C—H⋯O, C—H⋯π and C=O⋯π [2.883 (1) Å] inter­actions and aromatic π–π stacking inter­actions with a centroid–centroid distance of 3.6189 (7) Å.

2-{2-[2-(1,3-Dioxoisoindol-2-yl)ethoxy]ethyl}isoindole-1,3-dione