title: 4-(1-Cyclo-propyl-6-fluoro-4-oxo-1,4-dihydro-quinolin-7-yl)piperazin-1-ium 2,4,5-tricarb-oxy-benzene-1-carboxyl-ate monohydrate.
abstract: In the crystal of title compound, C(16)H(19)FN(3)O(+)·C(10)H(5)O(8) (-)·H(2)O, the water mol-ecule and the ions are connected by inter-molecular N-H⋯O and O-H⋯O hydrogen bonds and π-π stacking [centroid-centroid separation = 3.602 (1) Å] between the benzene ring and the pyridine ring, generating a three-dimensional supra-molecular structure.
authors.affiliation: College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715,  People's Republic of China.
authors.forename: Shi-Wei
authors.initials: SW
authors.lastname: Yan
authors.forename: Yan-Chen
authors.initials: YC
authors.lastname: Liang
authors.forename: Qin
authors.initials: Q
authors.lastname: Liao
authors.forename: Guang-Hua
authors.initials: GH
authors.lastname: Xin
authors.forename: Zhong-Li
authors.initials: ZL
authors.lastname: Ye