Abstract
In the title compound, C14H12FNO4S, the dihedral angle between the aromatic rings is 50.26 (9)degrees and the C-S-N-C bond adopts a gauche conformation [torsion angle = -68.12 (15)degrees]. The dihydrodioxine ring is disordered over two orientations, which both approximate to half-chairs, in a 0.880 (7):0.120 (7) ratio. In the crystal, N-H center dot center dot center dot O hydrogen bonds link the molecules into C(4) chains propagating in [100]. Weak C-H center dot center dot center dot O and C-H center dot center dot center dot F interactions consolidate the packing.