Used in bioconjugation and labeling of biomolecules, it serves as a linker to attach functional groups or probes to proteins, peptides, or other biological molecules. Its PEG (polyethylene glycol) chain enhances solubility and reduces immunogenicity, making it suitable for drug delivery systems. The propargyl group enables click chemistry reactions, particularly with azides, for efficient and selective coupling. This chemical is also applied in the development of bioconjugates for diagnostic imaging, therapeutic agents, and research tools in molecular biology.