3-(2,2-Dioxo-3,4-di-hydro-benzo[ e ][1,2,3]oxa-thiazin-4-yl)-3-fluoro-1-phenyl-indolin-2-one.

The title compound, C 21 H 15 FN 2 O 4 S, contains two chiral carbon centres, but crystal symmetry generates a racemic mixture. The crystal structure features N-H⋯O hydrogen bonding. The sulfonate group is disordered with an occupancy ratio of 0.933 (4):0.067 (4).