Used as a fluorescent labeling reagent for primary and secondary amines in biochemical and analytical applications. It reacts selectively with amine groups to form highly fluorescent derivatives, making it useful in detecting and quantifying amino-containing compounds such as amino acids, peptides, and proteins in HPLC and other separation techniques. Its high sensitivity and stability under various conditions allow for reliable detection at low concentrations. Also employed in fluorescence microscopy and bioimaging due to its bright emission and compatibility with biological samples.