Used in bioconjugation and drug delivery systems, it serves as a linker to attach bioactive molecules to polymers or nanoparticles. Its aminooxy group enables oxime ligation with aldehydes or ketones, facilitating stable conjugation under mild conditions. The PEG2 spacer enhances solubility and reduces steric hindrance, improving the efficiency of the conjugation process. Commonly applied in the development of antibody-drug conjugates (ADCs) and targeted therapeutics, it helps optimize pharmacokinetics and bioavailability. Additionally, it is utilized in peptide synthesis and protein modification to introduce functional groups or improve stability.