title: N-(2,3-Dimethyl-phen-yl)-4-hydr-oxy-2-methyl-2H-1,2-benzothia-zine-3-carboxamide 1,1-dioxide.
abstract: In the crystal structure of the title compound, C(18)H(18)N(2)O(4)S, the thia-zine ring adopts a distorted half-chair conformation. 1,2-Benzothia-zines 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 intra-molecular O-H⋯O hydrogen bond, forming a six-membered ring. The mol-ecules arrange themselves into centrosymmetric dimers by means of inter-molecular N-H⋯O hydrogen bonds. A weak inter-molcular C-H⋯O inter-action is also present.
authors.forename: Waseeq Ahmad
authors.initials: WA
authors.lastname: Siddiqui
authors.forename: Iftikhar Hussain
authors.initials: IH
authors.lastname: Bukahari
authors.forename: Muhammad
authors.initials: M
authors.lastname: Zia-Ur-Rehman
authors.forename: Islam Ullah
authors.initials: IU
authors.lastname: Khan
authors.forename: Graham John
authors.initials: GJ
authors.lastname: Tizzard