This chemical is widely used in bioconjugation and click chemistry applications due to its reactive propargyl group and polyethylene glycol (PEG) spacer. The propargyl group enables efficient coupling with azide-containing molecules through copper-catalyzed azide-alkyne cycloaddition (CuAAC), making it valuable for labeling biomolecules like proteins, peptides, and nucleic acids. The PEG spacer enhances solubility and reduces steric hindrance, improving reaction efficiency in aqueous environments. Additionally, it is utilized in the synthesis of drug delivery systems, where the ester group can be hydrolyzed to release active compounds. Its versatility also extends to material science, where it is employed in the functionalization of surfaces and polymers for advanced applications.