This chemical is widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a linker or spacer molecule, enabling the attachment of peptides to solid supports. The Fmoc group provides protection for the amine during synthesis, while the PEG8 spacer offers flexibility and solubility, enhancing the efficiency of the reaction. The carboxylic acid group at the end allows for further conjugation or modification of the peptide. It is also employed in bioconjugation, where it facilitates the coupling of peptides or proteins to other molecules, such as drugs, dyes, or polymers, for applications in drug delivery, diagnostics, and biomaterials. Its water-soluble PEG chain improves biocompatibility and reduces immunogenicity, making it suitable for biomedical research.