This compound is widely used in bioconjugation and peptide synthesis. It serves as a linker molecule, enabling the attachment of peptides or proteins to various surfaces or other molecules. The Fmoc group provides protection during solid-phase peptide synthesis, while the NHS ester reacts efficiently with primary amines, facilitating stable amide bond formation. Its PEG spacer enhances solubility and reduces steric hindrance, making it ideal for applications in drug delivery, surface modification, and the development of bioconjugates for therapeutic or diagnostic purposes.