Used in bioconjugation and drug delivery systems, it serves as a linker molecule to attach therapeutic agents or targeting moieties to biomolecules. Its PEG spacer enhances solubility and reduces immunogenicity, while the Boc group provides protection for the amine during synthesis. Commonly applied in the development of antibody-drug conjugates (ADCs) and peptide-based therapeutics. Also utilized in surface modification of nanoparticles to improve biocompatibility and stability.