4-(3-Fluoro­phen­yl)-1-(2-oxoindolin-3-yl­idene)thio­semicarbazide

In the title compound, C(15)H(11)FN(4)OS, there are three independent mol­ecules, each with a disordered 3-fluoro­phenyl group [occupancy ratios = 0.547 (17):0.453 (17), 0.645 (5):0.355 (5) and 0.626 (15):0.374 (15)] and displaying dihedral angles of 4.2 (3), 25.2 (6) and 32.4 (5)° between the 2-oxoindoline and fluoro-substituted phenyl rings. Strong intra­molecular N—H⋯N and N—H⋯O and weak intra­molecular C—H⋯S hydrogen bonds complete S(5) and S(6) ring motifs, while strong inter­molecular N—H⋯O hydrogen bonds inter­connect the three independent mol­ecules through R (3) (3)(12) ring motifs. The three-mol­ecule units are in turn linked into polymeric sheets via C—H⋯F and C—H⋯S hydrogen bonds and π–π inter­actions [centroid–centroid distances in the range 3.520 (2)–3.820 (9) Å].