In the title compound, C(27)H(22)N(2)O(4), the dihedral angles between the central benzene ring and the cyano-benzene ring and the 2H-coumarin ring system (r.m.s. deviation = 0.014 Å) are 22.95 (11) and 75.59 (8)°, respectively. Both terminal C atoms of the pendant diethyl-amino group lie to the same side of the coumarin ring system [deviations = 1.366 (2) and 1.266 (2) Å]. In the crystal, mol-ecules are linked by C-H⋯O and C-H⋯N hydrogen bonds and a C-H⋯π inter-action, generating a three-dimensional network.