Used as an analytical reagent for the detection and separation of certain metal ions, particularly in qualitative inorganic analysis. It acts as a selective precipitating agent for metals such as mercury, silver, and copper due to its ability to form stable, insoluble complexes. Its structure allows for strong coordination with soft metal ions, making it valuable in hydrometallurgical processes and environmental monitoring for heavy metal recovery. Also employed in the synthesis of heterocyclic compounds and pharmaceutical intermediates where thiourea derivatives are required.