Used as a fluorescent probe and labeling agent in biochemical and analytical applications due to its strong fluorescence and water solubility. It is commonly employed in the synthesis of fluorescent dyes and sensors for detecting biomolecules such as proteins and nucleic acids. Its sulfonate group enhances solubility in aqueous environments, making it suitable for use in biological assays and imaging. Also utilized in the development of fluorescent tracers for environmental and industrial fluid studies.