title: Crystal structure of a monoclinic polymorph of 5-amino-1,3,4-thia-diazol-2(3H)-one.
abstract: The title compound, C2H3N3OS, is a monoclinic (P21/c) polymorph of the previously reported triclinic structure [Kang et al. (2012 ▶). Acta Cryst. E68, o1198]. The asymmetric unit contains two independent mol-ecules which are essentially planar, with r.m.s. deviations of 0.001 and 0.032 Å from the mean plane defined by the seven non-H atoms. In the crystal, N-H⋯N and N-H⋯O hydrogen bonds link the mol-ecules into a sheet parallel to (111).
authors.affiliation: Department of Chemistry, Chungnam National University, Daejeon 305-764, Republic of Korea.
authors.forename: Namhun
authors.initials: N
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Chungnam National University, Daejeon 305-764, Republic of Korea.
authors.forename: Sung Kwon
authors.initials: SK
authors.lastname: Kang
keywords: crystal structure; hydrogen bonds; polymorph; thia­diazolone