title: 5-Carb-oxy-1,3-bis-(carb-oxy-meth-yl)-4-imidazolinium-4-carboxyl-ate.
abstract: The title compound, C(9)H(8)N(2)O(8), was obtained by the reaction of imidazole-4,5-dicarb-oxy-lic acid and 2-chloro-acetic acid. An intra-molecular O-H⋯O hydrogen bond occurs. The crystal packing is stabilized by intermolecular O-H⋯O and C-H⋯O hydrogen bonds, which link mol-ecules into a three-dimensional network.
authors.affiliation: College of Chemistry and Chemical Engineering, Key Laboratory of Eco-Environment-Related Polymer Materials of the Ministry of Education, Gansu Key Laboratory of Polymer Materials, Northwest Normal University, Lanzhou 730070,  People's Republic of China.
authors.forename: You-Ming
authors.initials: YM
authors.lastname: Zhang
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Ming
authors.forename: Jian-Peng
authors.initials: JP
authors.lastname: Dang
authors.forename: Wan-Qiang
authors.initials: WQ
authors.lastname: Zhang
authors.forename: Tai-Bao
authors.initials: TB
authors.lastname: Wei