This chemical is widely used in bioconjugation and click chemistry applications. It serves as a linker molecule, enabling the attachment of biomolecules, such as peptides, proteins, or antibodies, to other functional groups or surfaces. The thiol group allows for selective conjugation with cysteine residues or other thiol-containing molecules, while the propargyl group facilitates click chemistry reactions, particularly copper-catalyzed azide-alkyne cycloaddition (CuAAC). This makes it valuable in drug delivery systems, where it helps create targeted therapeutic agents, and in the development of bioconjugates for diagnostic or research purposes. Additionally, its polyethylene glycol (PEG) chains enhance solubility and reduce immunogenicity, making it suitable for use in biomedical and pharmaceutical applications.