4-amino-3-(4-pyridyl)-1,2,4-triazole-5(4H)-thione

In the title mol­ecule, C7H7N5S, the pyridyl and triazole rings form a dihedral angle of 20.07 (6)°. Inter­molecular N—H⋯N hydrogen bonds link the mol­ecules into chains extended in the direction [10\overline 1]. Further stability is provided by π⋯π stacking inter­actions, indicated by short distances between the centroids of triazole rings [3.480 (5) A] and pyridyl rings [3.574 (5) A] of neighbouring mol­ecules.