title: 1,2-Bis[amino-(pyrimidin-2-yl)methyl-ene]hydrazine dihydrate.
abstract: The centrosymmetric organic molecule in the title compound, C(10)H(10)N(8)·2H(2)O, is essentially flat and has a trans configuration. The mol-ecules are linked by inter-molecular O-H⋯N, N-H⋯O and N-H⋯N hydrogen bonds to form a linear chain structure.
authors.forename: Shuo
authors.initials: S
authors.lastname: Shi
authors.forename: Tian-Ming
authors.initials: TM
authors.lastname: Yao
authors.forename: Xiao-Ting
authors.initials: XT
authors.lastname: Geng
authors.forename: Lin
authors.initials: L
authors.lastname: Chen
authors.forename: Liang-Nian
authors.initials: LN
authors.lastname: Ji