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In the title mol­ecule, C 24 H 20 N 2 O 5 , the quinoline and quinolinone moieties are practically perpendicular to each other, forming a dihedral angle of 89.06 (3)°. In the crystal, each moiety forms coplanar π-stacked couples with the respective inversion equivalents. The quinolinone moieties overlap with their benzene rings with a centroid–centroid separation of 3.641 (2) Å, whereas the quinoline moieties overlap with their pyridine rings with a separation of 3.592 (2) Å. The resulting supra­molecular chains propargate along [101].

Diethyl 4-oxo-4H-[1,4′-biquinoline]-3,3′-dicarboxylate