Used in bioconjugation and chemical biology for attaching molecules to proteins, peptides, or other biomolecules. It acts as a linker, enabling the introduction of propargyl groups into target molecules for further functionalization via click chemistry. Commonly employed in the development of drug delivery systems, diagnostic probes, and bioconjugate vaccines. Its PFP ester group enhances reactivity with nucleophiles, facilitating efficient coupling reactions. Ideal for creating stable, site-specific modifications in complex biological systems.