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The title compound, C23H18O4, is a 1,4-enedione compound which contains a naphthalene ring and a benzene ring. The dihedral angle between the ring systems is 74.9 (2)°. In the crystal, the molecules form π–π stacking interactions between naphthalene rings of inversion-related molecules, with an interplanar spacing of 3.499 (2) Å.