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In the mol­ecule of the title compound, C 11 H 6 F 3 N 3 O, the three fused rings of the benzo[4,5]imidazo[1,2- a ]pyrimidine unit are essentially coplanar, the maximum deviation from the mean plane being 0.096 (2) Å. In the crystal, N—H⋯O hydrogen bonds link the mol­ecules into chains running along the  b -axis direction.

2-Trifluoromethyl-10H-benzo[4,5]imidazo[1,2-a]pyrimidin-4-one