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In the title compound, 2C11H10N3O4S+·SiF62−, the short C—N distance [1.386 (2) Å] is indicative of a slight conjugation of N with the π electrons of the pyridinium ring, and with those of the sulfonyl group. The dihedral angle between the benzene and pyridinium rings is 77.48 (7)°. The crystal structure is stabilized by N—H...F and C—H...F hydrogen bonds. The Si atom of the anion lies on a special position.