Used as a protected amine building block in organic synthesis, particularly in pharmaceutical and peptide chemistry. The tert-butoxycarbonyl (Boc) group provides stability under various reaction conditions while allowing selective deprotection under mild acidic conditions. The ethylene glycol linker with a terminal amino group enables conjugation to other molecules, making it valuable in the development of drug delivery systems, bifunctional reagents, and functionalized polymers. Its hydrophilic spacer arm improves solubility in aqueous and mixed solvent systems, facilitating reactions in biological and medicinal chemistry contexts.