title: 5-Carb-oxy-2-isopropyl-1H-imidazol-3-ium-4-carboxyl-ate monohydrate.
abstract: In the title compound, C(8)H(10)N(2)O(4)·H(2)O, the imidazole N atom is protonated and one of the carboxyl-ate groups is deprotoned, forming a zwitterion. An intra-molecular O-H⋯O hydrogen bond occurs. The crystal structure is stabilized by inter-molecular N-H⋯O and O-H⋯O hydrogen bonds. In addition, inter-molecular N-H⋯O and O-H⋯O hydrogen bonds link the mol-ecules into two-dimensional networks parallel to (10[Formula: see text]).
authors.forename: Chao-Jun
authors.initials: CJ
authors.lastname: Du
authors.forename: Zheng-Hai
authors.initials: ZH
authors.lastname: Shi
authors.forename: Li-Sheng
authors.initials: LS
authors.lastname: Wang
authors.forename: Chao-Ling
authors.initials: CL
authors.lastname: Du