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In the crystal structure of the title compound, 2C 5 H 5 N 4 O + ·SO 42− , N—H⋯O hydrogen bonds assemble the mol­ecules into a two-dimensional network structure parallel to the  cb  plane. The S atom of the sulfate ion lies on a special position on a twofold axis.

Bis[5-oxo-4,5-dihydro-8H-2-azonia-4,8,9-trizabicyclo[4.3.0]nona-2,6,9(1)-triene] sulfate