Used as an analytical reagent for the detection and separation of heavy metal ions, particularly in qualitative inorganic analysis. It acts as a selective precipitating agent for metals such as copper, lead, and mercury due to its ability to form insoluble complexes. Also employed in the synthesis of heterocyclic compounds and as an intermediate in the production of pharmaceuticals and agrochemicals. Its sulfur and nitrogen donor atoms make it useful in coordination chemistry for designing metal ligands.