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In the title  N -substituted benzimidazol-2-one, C 10 H 10 N 2 O, the fused ring system is almost planar (r.m.s. deviation = 0.01 Å) and aligned at 57.9 (1)° with respect to the propenyl fragment. In the crystal, adjacent mol­ecules are linked by pairs of N—H⋯O hydrogen bonds into inversion dimers.

1-Isopropenyl-1H-1,3-benzimidazol-2(3H)-one