Used as a fluorescent labeling reagent for chiral amines and amino acids in analytical and biochemistry applications. Its isothiocyanate group reacts selectively with primary amines to form stable thiourea derivatives, enabling detection and quantification via fluorescence. The (R)-enantiomeric form provides stereoselective labeling, useful in resolving enantiomers in HPLC or capillary electrophoresis. Commonly applied in studies involving neurotransmitters, peptides, and pharmaceuticals where sensitive and selective detection of chiral amines is required.