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The title compound, C 23 H 18 O 4 , 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.

(E)-Ethyl 2-benzoyl-4-(naphthalen-2-yl)-4-oxobut-2-enoate