Used primarily as a hydrophilic spacer or linker in pharmaceutical and biochemical applications. Its structure allows for conjugation of molecules while enhancing solubility in aqueous environments. Commonly employed in the synthesis of prodrugs, peptide modifications, and bioconjugation techniques such as antibody-drug conjugates (ADCs). The ether linkages provide flexibility and resistance to enzymatic degradation, improving the stability and pharmacokinetics of the final compound. Also utilized in polymer chemistry to introduce hydrophilic segments into copolymers for drug delivery systems.