Used as a fluorescent labeling reagent in bioanalytical chemistry, particularly for tagging amines and other nucleophiles in proteins and peptides. Its strong electron-withdrawing nature and fluorescence properties make it suitable for detection and imaging in biological systems. Commonly applied in HPLC and capillary electrophoresis for sensitive detection of amino acids and small biomolecules. Also utilized in the development of fluorescent sensors and probes due to its stability and distinct emission characteristics.