Used primarily as a hydrophilic spacer or linker in pharmaceutical and biochemical applications. Its long, flexible chain with multiple ether groups enhances solubility in water and improves the bioavailability of conjugated molecules. Commonly employed in the synthesis of antibody-drug conjugates (ADCs), peptide modifications, and diagnostic probes where controlled distance between functional groups is required. Also utilized in surface functionalization of nanoparticles and biosensors to reduce non-specific binding and increase stability in biological environments.