title: Pyrazine-diium bis-(3-carb-oxy-4-hydroxy-benzene-sulfonate) dihydrate.
abstract: Pyrazine and 5-sulfosalicylic acid crystallize from a methanol solution containing water as the title salt, C(4)H(6)N(2) (2+)·2C(7)H(5)O(6)S(-)·2H(2)O. The pyrazine-diium cation sits on an inversion center. The component ions and water mol-ecules are linked by inter-molecular O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds into layers running parallel to the (10) plane.
authors.forename: Jia-Rong
authors.initials: JR
authors.lastname: Wang
authors.forename: Ze-Hui
authors.initials: ZH
authors.lastname: Yang
authors.forename: Chun-Hai
authors.initials: CH
authors.lastname: Liu
authors.forename: Ling-Lan
authors.initials: LL
authors.lastname: Li