Used as a linker in bioconjugation chemistry, it facilitates the attachment of biomolecules to various surfaces or other molecules, enhancing drug delivery systems. Its PEG (polyethylene glycol) chain improves solubility and stability of conjugated compounds, making it valuable in pharmaceutical research. The tert-butyl ester group allows for controlled release or activation of the attached molecule under specific conditions. Commonly applied in the development of targeted therapies, diagnostics, and protein modification studies.