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In the title compound, C11H11N2O2S+·NO3−, the dihedral angle between the benzene and pyridinium rings is 87.59 (8)°. An intramolecular C—H...O interaction occurs in the cation. In the crystal structure, ion pairs occur, being linked by two strong N—H...O interactions, forming R22(8) loops. The packing is further stabilized by weak C—H...O interactions.