title: 5-(4-Hy-droxy-phen-yl)imidazolidine-2,4-dione.
abstract: The title compound, C9H8N2O3, was prepared by reaction of phenol, glyoxylic acid and urea in water. The imidazolidine ring adopts an almost planar conformation (r.m.s. deviation = 0.012 Å) and is twisted by 89.3 (1)° relative to the benzene ring. In the crystal, mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds into a three-dimensional framework.
authors.affiliation: Department of Chemistry and Chemical Engineering, Lvliang University, Lvliang, Shanxi 033001, People's Republic of China.
authors.forename: Jin-Hui
authors.initials: JH
authors.lastname: Xue
authors.affiliation: Laboratory of Medicinal Chemistry, Lvliang University, Lvliang, Shanxi 033001, People's Republic of China.
authors.forename: Yong-Qi
authors.initials: YQ
authors.lastname: Qin
authors.affiliation: Department of Chemistry and Chemical Engineering, Lvliang University, Lvliang, Shanxi 033001, People's Republic of China.
authors.forename: Zi-Feng
authors.initials: ZF
authors.lastname: Zhang
authors.affiliation: Laboratory of Medicinal Chemistry, Lvliang University, Lvliang, Shanxi 033001, People's Republic of China.
authors.forename: Yuan-Biao
authors.initials: YB
authors.lastname: Qiao