(E)-1-[(2-Chloro-5-methyl-pyridin-3-yl)methyl-ene]thiosemicarbazide.

The title compound, C(8)H(9)ClN(4)S, which has potential insecticidal activity, was synthesized by the reaction of 2-chloro-5-methyl-nicotinaldehyde and thio-semicarbazide. In the crystal structure, the mol-ecules are linked via inter-molecular N-H⋯N, N-H⋯S and N-H⋯Cl hydrogen bonds, forming a three-dimensional network stacked down a.