This chemical is widely utilized in bioconjugation and drug delivery systems due to its polyethylene glycol (PEG) spacer, which enhances solubility and reduces immunogenicity. The Boc (tert-butoxycarbonyl) protecting group allows for selective deprotection, enabling controlled reactions in peptide synthesis. The carboxylic acid end group facilitates covalent attachment to biomolecules, such as proteins, antibodies, or nanoparticles, making it valuable in targeted therapy and diagnostic applications. Its PEG chain also improves biocompatibility and prolongs circulation time in vivo, making it suitable for developing advanced therapeutic agents and imaging probes.