This chemical is widely used in bioconjugation and drug delivery systems due to its polyethylene glycol (PEG) spacer, which enhances solubility and reduces immunogenicity. The Boc (tert-butoxycarbonyl) group serves as a protective group for amines, allowing selective deprotection during synthesis. The terminal carboxylic acid group enables covalent attachment to biomolecules like peptides, proteins, or drugs, facilitating the creation of targeted therapeutics. Its application is particularly valuable in developing antibody-drug conjugates (ADCs) and PEGylated drugs, where it improves pharmacokinetics and stability. Additionally, it is utilized in material science for modifying surfaces or creating functionalized polymers for biomedical applications.