Used in bioconjugation and click chemistry, it serves as a linker for attaching biomolecules like proteins, peptides, or antibodies to other entities such as fluorescent dyes, drugs, or nanoparticles. Its propargyl group enables efficient copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions, while the PEG spacer enhances solubility and reduces steric hindrance. This makes it valuable in drug delivery systems, diagnostic tools, and targeted therapies, particularly in cancer research and biomarker studies. Additionally, it’s utilized in surface modification and material science for creating functionalized surfaces or polymers.