Used in bioconjugation to link molecules such as peptides, proteins, or dyes to surfaces or other biomolecules. The PFP ester group reacts efficiently with primary amines, forming stable amide bonds, while the azide (N3) group enables click chemistry, especially copper-catalyzed azide-alkyne cycloaddition (CuAAC). The PEG2 spacer improves solubility and reduces steric hindrance, enhancing reaction efficiency. Commonly applied in drug delivery systems, antibody-drug conjugates (ADCs), and surface functionalization of nanoparticles or biosensors. Stable under standard handling conditions but should be protected from moisture to preserve ester reactivity.