This chemical is widely used in bioconjugation and drug delivery systems due to its bifunctional nature. The amino group allows for easy attachment to biomolecules like proteins, peptides, or antibodies, while the carboxylic acid group facilitates further modification or conjugation to other molecules. Its polyethylene glycol (PEG) spacer enhances solubility, reduces immunogenicity, and improves the stability of the conjugated compounds. It is particularly valuable in the development of targeted therapies, antibody-drug conjugates, and diagnostic agents. Additionally, it is employed in surface modification of nanoparticles to enhance biocompatibility and prolong circulation time in vivo.