Used as a hydrophilic spacer or linker in pharmaceutical and biochemical applications, particularly in the synthesis of conjugated drugs, peptides, and diagnostic probes. Its polyether chain enhances solubility in aqueous systems and improves bioavailability of conjugated molecules. Commonly employed in the development of PEG-like linkers for antibody-drug conjugates (ADCs) and in surface functionalization of nanoparticles and biosensors due to its terminal amino and hydroxyl groups, allowing selective coupling reactions. Also utilized in polymer chemistry to modify material hydrophilicity and flexibility.