title: 1-(4-Hydr-oxy-2-methyl-1,1-dioxo-2H-1,2-benzothia-zin-3-yl)ethanone.
abstract: In the title compound, C(11)H(11)NO(4)S, the thia-zine ring adopts a distorted half-chair conformation. The enolic H atom is involved in an intra-molecular O-H⋯O hydrogen bond, forming a six-membered ring. Mol-ecules are linked through weak inter-molecular C-H⋯O hydrogen bonds, resulting in chains lying along the b axis.
authors.forename: Matloob
authors.initials: M
authors.lastname: Ahmad
authors.forename: Hamid Latif
authors.initials: HL
authors.lastname: Siddiqui
authors.forename: Muhammad
authors.initials: M
authors.lastname: Zia-Ur-Rehman
authors.forename: Muhammad Irfan
authors.initials: MI
authors.lastname: Ashiq
authors.forename: Graham John
authors.initials: GJ
authors.lastname: Tizzard