This chemical is primarily utilized in the synthesis of peptide conjugates and biomaterials, particularly in the field of bioconjugation and drug delivery systems. Its structure, featuring an Fmoc-protected amino group and a carboxylic acid terminus, makes it suitable for solid-phase peptide synthesis (SPPS). The long polyethylene glycol (PEG) spacer enhances solubility and reduces immunogenicity, making it ideal for creating PEGylated peptides or proteins. It is also employed in the development of targeted drug delivery systems, where the PEG chain helps improve circulation time and stability of therapeutic agents. Additionally, its bifunctional nature allows for the attachment of various biomolecules, enabling the creation of complex molecular architectures for research and therapeutic applications.