Used extensively in bioconjugation and click chemistry, this compound serves as a linker for attaching molecules to proteins, peptides, or other biomolecules. Its PEG spacer enhances solubility and reduces steric hindrance, making it ideal for creating stable conjugates in drug delivery systems. The azide group allows for efficient copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions, enabling precise modification of biomolecules. It is also employed in the development of antibody-drug conjugates (ADCs), where it helps link therapeutic agents to antibodies for targeted cancer therapy. Additionally, it finds use in surface functionalization of nanoparticles and hydrogels for biomedical applications.