Used primarily as a reagent in organic synthesis, particularly for the derivatization of amino acids, peptides, and proteins. It reacts with primary and secondary amines to form stable thiourea derivatives, aiding in the identification and quantification of these compounds in analytical chemistry. Additionally, it serves as a building block in the preparation of various heterocyclic compounds, which are valuable in pharmaceutical research and development. Its role in labeling and modifying biomolecules makes it useful in biochemical studies and proteomics.