title: 2-Nitro-N-(4-pyridinio)benzene-sulfonamidate.
abstract: The title compound, C(11)H(9)N(3)O(4)S, crystallizes with two mol-ecules in the asymmetric unit; each mol-ecule exists as a zwitterion in the solid state. Inter-molecular N-H⋯N hydrogen bonds link the mol-ecules into chains. Weak C-H⋯O inter-actions further stabilize the crystal structure.
authors.forename: Jiang-Sheng
authors.initials: JS
authors.lastname: Li
authors.forename: Dao-Wu
authors.initials: DW
authors.lastname: Yang
authors.forename: Wei-Dong
authors.initials: WD
authors.lastname: Liu