In the title compound, C13H14N2O2, the C5 ring has an envelope conformation with the C atom adjacent to the quaternary C being the flap. The five atoms comprising the imidazolidine-2,4-dione ring are almost planar (r.m.s. deviation = 0.004 Å). The dihedral angle between the five-membered rings is 89.66 (10)°. In the crystal, inversion-related mol­ecules are connected via {⋯HNCO}2 synthons. These are linked into a helical supra­molecular chain along [010] by C—H⋯O inter­actions.

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