In the title compound, C(20)H(20)N(2)O(3), the ten atoms comprising the quinazoline ring are essentially planar (r.m.s. deviation = 0.024 Å), and this plane is almost orthogonal to the terminal phenyl ring [dihedral angle = 82.87 (7)°]. The conformation about the ethyl-ene bond [1.335 (2) Å] is E and there is a significant twist between this residue and the adjacent phenyl ring [C-C-C- torsion angle = -48.4 (3)°]. The crystal structure features centrosymmetric dimeric units linked by pairs of N-H⋯O hydrogen bonds between the amide groups which lead to eight-membered {⋯HNCO}(2) synthons. These are consolidated into a three-dimensional architecture by C-H⋯O, C-H⋯π and π-π inter-actions [centroid-centroid distances = 3.5087 (8) and 3.5645 (9) Å].