This compound is widely used in bioconjugation and click chemistry applications. It serves as a linker in the synthesis of peptide-based drugs, enabling the attachment of functional groups or biomolecules. Its PEG (polyethylene glycol) spacer enhances solubility and reduces immunogenicity, making it valuable in drug delivery systems. The propargyl group allows for efficient copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions, facilitating the creation of stable triazole linkages. Additionally, it is employed in the development of targeted therapeutics, such as antibody-drug conjugates (ADCs), and in the modification of biomaterials for biomedical research.