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

Abstract

In the asymmetric unit of the title compound, C17H12F3NO4S, 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 R22(8)] and are extended into chains along [101] through weak C—H...Osulfinyl hydrogen bonds [graph set R22(14)]..