7-{4-[(1,3-Benzodioxol-5-yl)meth-yl]piperazin-1-yl}-1-cyclo-propyl-6-fluoro-4-oxo-1,4-dihydro-quinoline-3-carb-oxy-lic acid.

In the title structure, C(25)H(24)FN(3)O(5), a strong intra-molecular O-H⋯O hydrogen bond is present between the carb-oxy group at the 3-position and the carbonyl group at the 4-position. In the crystal, mol-ecules are held together by weak C-H⋯O, C-H⋯F and π-π [centroid-centroid distance 3.6080 (8) Å] inter-actions. The 1,4-dihydro-quinoline ring and cyclo-propyl group are not in the same plane, making an inter-planar angle of 57.52 (8)°.