2-[(E)-1,1-Dioxo-2-(2,4,5-tri­fluoro­benz­yl)-3,4-di­hydro-2H-1,2-benzo­thia­zin-4-yl­idene]acetic acid

In the asymmetric unit of the title compound, C(17)H(12)F(3)NO(4)S, there are two conformationally similar mol­ecules in which the heterocyclic thia­zine ring adopts a half-chair conformation, with the dihedral angle between the two benzene rings being 24.84 (8) and 37.42 (8)°. In the crystal, the mol­ecules form dimers through cyclic carb­oxy­lic acid O—H⋯O hydrogen-bonding associations [graph set R (2) (2)(8)] and are extended into chains along [101] through weak C—H⋯O(sulfin­yl) hydrogen bonds [graph set R (2) (2)(14)]..