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The 3-methyl­butanoyl group and the 5-fluoro­uracil unit of the title compound, C 9 H 11 FN 2 O 3 , are essentially coplanar, with the carbonyl group oriented towards the ring CH group and away from the nearer ring carbonyl group. The 3-methyl­butanoyl (C=)C—N—C=O torsion angle of 9.6 (2)° is comparable to that in structurally related compounds. In the solid state, two inversion-related mol­ecules form N—H⋯O hydrogen bonds to generate an inter­molecular  R22 (8) ring. The crystal structure also diplays intra- and inter­molecular C—H⋯O inter­actions.

5-Fluoro-1-(3-metylbutanoyl)pyrimidine-2,4(1H,3H)-dione