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In the title molecule, C17H20N2O4, the inner part of the ester substituent is nearly perpendicular to the dihydropyridazine ring, forming a dihedral angle of 83.21 (7)°. In the crystal, inversion dimers are formed by pairwise C—H...O interactions with the dimers connected into chains extending along the b-axis direction by C—H...π(ring) interactions. The chains are connected by π-stacking interactions to give corrugated layers parallel to the ab plane. The terminal ethyl group is disordered over two two sets of sites with the major component having a site occupancy factor of 0.715 (10)