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In the title compound, C 23 H 18 FNO 3 , the tricyclic 9-fluorenyl system is approximately planar (r.m.s. deviation = 0.0279 Å). The N—C(=O) bond length is comparatively short [1.359 (3) Å], which is typical for such conjugated systems. The N atom has a planar configuration [sum of bond angles= 359.8°] due to conjugation of its lone pair with the π-system of the carbonyl group. In the crystal, a three-dimensional network is formed through N—H⋯O and O—H⋯O hydrogen bonds between the amide and carb­oxy­lic acid groups and carbonyl O-atom acceptors.

2-(9H-Fluoren-9-yl)-4-(4-fluoroanilino)-4-oxobutanoic acid