title: 2-(3-Oxo-2,3-dihydro-1,2-benzothia-zol-2-yl)acetic acid.
abstract: In the title compound, C(9)H(7)NO(3)S, the benzoisothia-zolone ring system is essentially planar, with a maximum deviation of 0.013 (2) Å. In the crystal, mol-ecules are linked via O-H⋯O hydrogen bonds, forming chains along [010]. In addition, weak inter-molecular C-H⋯O hydrogen bonds are present.
authors.forename: Xiang-Hui
authors.initials: XH
authors.lastname: Wang
authors.forename: Jian-Xin
authors.initials: JX
authors.lastname: Yang
authors.forename: Cheng-Hang
authors.initials: CH
authors.lastname: You
authors.forename: Xue-Mei
authors.initials: XM
authors.lastname: Tan
authors.forename: Qiang
authors.initials: Q
authors.lastname: Lin