Used as a derivatizing agent in analytical chemistry, particularly in the detection and quantification of primary amines and amino acids. It reacts selectively with amine groups to form stable thiourea derivatives that are easily detectable by HPLC or UV spectroscopy. Commonly applied in biochemical research for labeling peptides and proteins. Also utilized in the synthesis of certain agrochemicals and pharmaceutical intermediates due to its reactivity toward nucleophiles. Its ability to modify functional groups makes it valuable in the development of sensors and diagnostic reagents.