Endoannular reactions and ring–chain tautomerism. Structure of 1-(2-hydroxyethyl)-3-methyl-2,4(1H,3H)-quinazolinedione

1,3-Dibenzyl-1,2,3,4-tetra-hydro-quinazoline-2,4-dione

The asymmetric unit of the title compound, C₂₂H₁₈N₂O₂, contains two independent mol­ecules, which differ in the orientations of the benzyl groups with respect to the planar (r.m.s. deviations of 0.031 and 0.020 Å) quinazoline-2,4-dione skeletons [dihedral angles of 73.97 (4) and 70.07 (4)° in the first mol­ecule and 75.63 (4) and 63.52 (3)° in the second]. The crystal structure is stabilized by weak inter­molecular C—H⋯O and C—H⋯π interactions and aromatic π–π stacking inter­actions [centroid–centroid distance = 3.735 (2) Å].