This chemical is primarily used in bioconjugation and peptide synthesis. It serves as a protective group for amines during the synthesis of complex molecules, ensuring selective reactions at specific sites. The PEG4 spacer enhances solubility and flexibility, making it suitable for modifying biomolecules like proteins and peptides. Additionally, it is employed in the development of drug delivery systems, where it helps in creating stable and targeted conjugates. Its Boc group can be easily removed under mild acidic conditions, allowing for further functionalization in multi-step synthetic processes.