Used in click chemistry reactions due to the azide group, enabling efficient conjugation with alkynes for bioconjugation and labeling applications. The triethylene glycol spacer provides water solubility and flexibility, making it useful in modifying biomolecules, polymers, and surfaces. Commonly employed in drug delivery systems, PEGylation, and the synthesis of functionalized linkers for pharmaceuticals and diagnostics. The tert-butyl ester group allows for easy deprotection under mild acidic conditions, enabling further chemical modifications.