Used as a hydrophilic linker or spacer in pharmaceutical and polymer synthesis, particularly in prodrug design and PEGylation. Its multiple ether oxygen atoms enhance water solubility and improve bioavailability of conjugated molecules. Commonly employed in creating biodegradable linkers for drug delivery systems, where the ester group allows for enzymatic or hydrolytic cleavage, releasing the active compound under physiological conditions. Also utilized in the development of functionalized polymers and surface coatings requiring flexible, non-toxic, and hydrophilic segments.