In the title molecule, C16H14N2O2, the imidazolidine-2,4-dione ring carries two phenyl substituents at the 5-position inclined to the five-membered ring plane by 59.17 (6) and 53.21 (6)°. In the crystal, the molecules form chains parallel to the a-axis direction through N—H...O hydrogen bonds. These chains are linked into a three-dimensional network of molecules stacked along a through C—H...π(ring) interactions.
