N-(2,3-Dimethyl­phen­yl)-4-hydr­oxy-2-methyl-2H-1,2-benzothia­zine-3-carboxamide 1,1-dioxide

In the crystal structure of the title compound, C(18)H(18)N(2)O(4)S, the thia­zine ring adopts a distorted half-chair conformation. 1,2-Benzothia­zines of this kind have a wide range of biological activities and are mainly used as medicines in the treatment of inflammation and rheumatoid arthritis. The enolic H atom is involved in an intra­molecular O—H⋯O hydrogen bond, forming a six-membered ring. The mol­ecules arrange themselves into centrosymmetric dimers by means of inter­molecular N—H⋯O hydrogen bonds. A weak inter­molcular C—H⋯O inter­action is also present.