14-Eth­oxy-4,6,9-trimethyl-8,12-dioxa-4,6-diaza­tetra­cyclo­[8.8.0.0^2,7.0^13,18]octa­deca-2(7),13,15,17-tetra­ene-3,5,11-trione

In the title compound, C₁₉H₂₀N₂O₆, the pyrone and pyran rings adopt envelope conformations with the same common C atom as the flap, the dihedral angle between the planes of the remaining ring atoms being 68.27 (4)°. The planar atoms of the pyran ring and the diaza­cyclic ring are almost coplanar, the dihedral angle between their mean planes being 3.29 (7)°. Moreover, the planar atoms of the pyrone ring and benzene ring of the coumarin unit are also close to coplanar, the dihedral angle between their mean planes being 8.03 (9)°. The meth­oxy group lies in the plane of the benzene ring, with a dihedral angle between their mean planes of 9.4 (2)°. In the crystal, the molecules are linked by C—H...O hydrogen bonds resulting in sheets of mol­ecules in the ac plane.