1 Department of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan'an University, Yan'an, Shaanxi, 716000, People's Republic of China.
In the title compound, C(9)H(9)N(5)S, the pyridyl and triazine rings make a dihedral angle of 4.8 (2)°. In the crystal, adjacent mol-ecules are bridged by an N-H⋯N hydrogen bond, forming a helical chain running along the b axis.