Used in bioconjugation and chemical biology, it serves as a linker for attaching molecules to proteins, peptides, or other biomolecules. Its Boc-protected aminooxy group allows for selective deprotection and reaction with aldehydes or ketones, enabling the creation of stable oxime bonds. The PEG2 spacer enhances solubility and reduces steric hindrance, making it ideal for modifying biomolecules in drug delivery, diagnostic tools, and targeted therapies. It is particularly valuable in creating antibody-drug conjugates (ADCs) or functionalizing nanoparticles for biomedical applications.