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The asymmetric unit of the title compound, C7H8N4S, contains two independent molecules with slightly different conformations; the dihedral angles between the pyridine ring and mean plane of the thiosemicarbazone unit in the two molecules are 2.88 (5) and 6.30 (5)°. Intermolecular N—H...N and N—H...S hydrogen bonds link the molecules into layers parallel to the ab plane.