Used as a key intermediate in the synthesis of fluorescent dyes and probes due to the naphthalene group’s strong fluorescence properties. The amine functionality allows for further chemical modifications, making it useful in developing bioimaging agents and sensors for biological molecules. Also employed in the preparation of labeled peptides and proteins for research in molecular biology and drug discovery. Its hydrochloride form enhances solubility in aqueous media, beneficial for reactions in polar solvents and biological assays.