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The title compound, C 12 H 12 FNO 3 , crystallizes with two independent mol­ecules ( A  and  B ) in the asymmetric unit. The dihedral angle between the mean planes of the 3-fluoro-4-methyl­phenyl ring and the oxo­amine group is 25.7 (7)° in mol­ecule  A  and 71.3 (7)° in mol­ecule  B , while the mean plane of the 2-methyl­idene-4-oxo­butanoic acid group is twisted by 76.2 (1)° from that of the oxo­amine group in mol­ecule  A  and by 76.2 (4)° in mol­ecule  B . In the crystal, N—H⋯O and O—H⋯O hydrogen bonds [the latter forming an  R   2   2 (8) graph-set motif] link the mol­ecules into a two-dimensional network parallel to the  ac  plane.

4-(3-Fluoro-4-methylanilino)-2-methylidene-4-oxobutanoic acid