Used as a key intermediate in the synthesis of functionalized polymers and surface modifiers, particularly in pharmaceutical and biotechnology applications. Its multiple ether linkages and carboxylic acid group enable conjugation with biomolecules, improving solubility and biocompatibility. Commonly employed in the development of PEG-like linkers for drug delivery systems and antibody-drug conjugates (ADCs). Also utilized in modifying nanoparticles and surfaces to reduce protein adsorption and enhance stability in biological environments.