This chemical is widely used in bioconjugation and chemical biology research. It serves as a linker or spacer in the modification of biomolecules, such as proteins, peptides, and antibodies, enabling the attachment of functional groups or labels. Its PEG (polyethylene glycol) component enhances solubility and reduces immunogenicity, making it suitable for applications in drug delivery systems and therapeutic agent development. The aminooxy group allows for specific and efficient conjugation with carbonyl-containing molecules, facilitating the creation of stable oxime bonds. This property is particularly useful in the synthesis of targeted drug conjugates, diagnostic probes, and biomaterial engineering. Additionally, its tert-butyl ester group provides protection during synthesis, which can be removed under mild conditions for further functionalization.