Used extensively in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS), as a linker or spacer molecule. Its long polyethylene glycol (PEG) chain enhances solubility and flexibility, making it ideal for connecting peptides to solid supports or other molecules. The Fmoc group provides protection for the amine during synthesis, ensuring controlled and precise peptide assembly. Commonly employed in the development of peptide-based drugs, bioconjugates, and biomaterials, where its properties improve bioavailability and stability. Also utilized in the creation of hydrogels and drug delivery systems due to its biocompatibility and ability to modify pharmacokinetics.