This chemical is widely used in bioconjugation and drug delivery systems due to its unique properties. The propargyl group allows for click chemistry reactions, particularly copper-catalyzed azide-alkyne cycloaddition (CuAAC), enabling efficient and selective attachment to biomolecules, peptides, or other functional groups. The PEG (polyethylene glycol) spacer enhances solubility, reduces immunogenicity, and improves stability, making it ideal for modifying therapeutic proteins, antibodies, or nanoparticles. Additionally, the amine group provides a reactive site for further functionalization, such as coupling with carboxylic acids or other amine-reactive molecules. It is particularly valuable in the development of targeted drug delivery systems, diagnostic probes, and bioconjugate vaccines. Its versatility also extends to materials science, where it is used to modify surfaces or create functionalized polymers for biomedical applications.