Used primarily as a derivatization reagent in high-performance liquid chromatography (HPLC) for labeling compounds containing primary or secondary amines. It enables sensitive detection of amine-containing analytes such as amino acids, peptides, and biogenic amines by forming stable fluorescent or UV-absorbing derivatives. The hydrochloride salt form enhances solubility and stability during the labeling reaction. Particularly useful in pharmaceutical and biochemical analysis where high sensitivity and reproducibility are required. Reactions are typically carried out under mild conditions to preserve labile functional groups in complex molecules.