Used as a crosslinking agent in bioconjugation processes, particularly for attaching biomolecules like proteins, peptides, or antibodies to other surfaces or molecules. Its azide group enables click chemistry reactions, such as the copper-catalyzed azide-alkyne cycloaddition (CuAAC), which is highly efficient and selective. The pentafluorophenyl ester (PFP) group facilitates easy coupling with amines, making it suitable for modifying amine-containing compounds. Its PEG spacer enhances solubility and reduces steric hindrance, ensuring better accessibility in reactions. Commonly applied in drug delivery systems, surface functionalization, and the development of biosensors or diagnostic tools.