Used primarily as a derivatizing agent in analytical chemistry, it reacts with amines, amino acids, and peptides to form stable thiourea derivatives, aiding in their identification and quantification via techniques like HPLC or mass spectrometry. It is also employed in the synthesis of heterocyclic compounds and in the preparation of biologically active molecules for pharmaceutical research. Additionally, it serves as a labeling reagent in proteomics for studying protein interactions and modifications.