Used primarily as a fluorescent labeling reagent in biochemical and analytical applications. Its ability to react with nucleophiles allows it to be conjugated to amines, thiols, and other functional groups in biomolecules, making it useful for tagging peptides, proteins, and nucleic acids for detection and imaging. Commonly employed in fluorescence microscopy, flow cytometry, and immunoassays due to the strong and stable fluorescence signal it provides upon excitation. Also utilized in the synthesis of fluorescent probes and sensors for monitoring biological processes and detecting specific analytes in solution.