The title compound, C17H13FN2O2, has a dihedral angle of 160.5(1)degre
es between the fluorobenzylidene and the imidazolidinedione rings with
an angle of 109.3(1)degrees between the latter ring and the benzyl ri
ng. The molecules are linked by an N-H...O hydrogen bond [N...O 2.852(
3) Angstrom].