Used in bioconjugation and pharmaceutical research as a hydrophilic linker to improve solubility and reduce aggregation of drug molecules. Its PEG10 chain provides flexibility and extended circulation time in biological systems. The propargyl group enables click chemistry reactions, especially copper-catalyzed azide-alkyne cycloaddition (CuAAC), for efficient labeling or attachment to biomolecules like peptides, proteins, or fluorescent tags. The terminal alcohol allows further functionalization or attachment to surfaces, making it useful in developing diagnostics, targeted therapies, and surface coatings in biomedical devices.