Used as a fluorescent labeling reagent in biochemical and analytical applications. It reacts selectively with primary amines and sulfhydryl groups on proteins, peptides, and other biomolecules, enabling their detection and quantification through fluorescence. Commonly employed in fluorescence microscopy, flow cytometry, and electrophoresis due to its strong emission in the visible range and high sensitivity. Also utilized in the development of fluorescent probes for studying molecular interactions and cellular processes.