Used in bioconjugation and drug delivery systems, it serves as a linker molecule to connect bioactive molecules with targeting agents or carriers. Its Boc-protected aminooxy group allows for selective conjugation with aldehydes or ketones, enabling controlled release of drugs or targeted delivery. The PEG1 spacer enhances solubility and reduces immunogenicity, while the amine group facilitates further functionalization. Commonly applied in the development of antibody-drug conjugates (ADCs) and peptide-based therapeutics.