4-Amino-3-phenyl-1H-1,2,4-triazole-5(4H)-thione

In the title compound, C8H8N4S, the planar triazole ring forms a dihedral angle of 13.7 (2)° with the phenyl ring. The crystal structure is stabilized by inter­molecular N—H⋯S hydrogen-bond inter­actions, linking the mol­ecules into chains along the a axis.