6-Methyl-1-({[(2E)-2-methyl-3-phenyl­prop-2-en-1-yl]­oxy}meth­yl)-1,2,3,4-tetra­hydro­quinazoline-2,4-dione

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 ethyl­ene 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 inter­actions [centroid–centroid distances = 3.5087 (8) and 3.5645 (9) Å].