title: 2,2'-(4,6-Dinitro-1,3-phenyl-enedi-oxy)diacetic acid dihydrate.
abstract: In the title compound, C(10)H(8)N(2)O(10)·2H(2)O, the skeleton of the dicarboxylic acid mol-ecule is approximately planar, the largest deviation being 0.477 (1) Å for an O atom of a nitro group; this nitro group is twisted out of the plane of the ring by 24.6 (1)°. Adjacent mol-ecules are linked by O-H⋯O hydrogen bonds, which connect the dicarboxylic acid and water mol-ecules into a three-dimensional supra-molecular network.
authors.affiliation: College of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, People's Republic of China.
authors.forename: Dong-Sheng
authors.initials: DS
authors.lastname: Ma
authors.forename: Xiu-Mei
authors.initials: XM
authors.lastname: Zhang
authors.forename: Dan
authors.initials: D
authors.lastname: Mu
authors.forename: Guang-Feng
authors.initials: GF
authors.lastname: Hou