Cytosinium 3,5-dinitrosalicylate

The crystal structure of cytosinium 3,5-dinitrosalicylicate (systematic name: 6-amino-2-oxo-2,3-dihydropyrimidinium 3,5-dinitrosalicylate), C4H6N3O+.C7H3N2O7-, shows the presence of a primary heteroionic cyclic R-2(2)(8) interaction between the H-atom donors of the protonated cytosinium cation and the carboxylate O-atom acceptors of the 3,5-dinitrosalicylate anion. Additional peripheral hydrogenbonding interactions involving all available cytosinium H-atom donors and both phenol and nitro O-atom acceptors of the anion species give a three-dimensional polymeric structure.