Used as a hydrophilic spacer arm in the synthesis of bioconjugates, particularly in linking biomolecules like peptides or antibodies to labels, drugs, or solid supports. Its long, flexible polyethylene glycol (PEG)-like chain improves solubility, reduces aggregation, and enhances the stability of conjugated compounds. Commonly employed in diagnostic assays and targeted drug delivery systems where increased circulation time and reduced immunogenicity are desired. Also utilized in surface modification of nanoparticles and biosensors to minimize non-specific binding and improve biocompatibility.