Used primarily in peptide synthesis, this compound serves as a protected amino acid derivative. It is particularly valuable in solid-phase peptide synthesis (SPPS) for constructing peptides with specific sequences. The Fmoc group provides temporary protection for the amino group, while the benzyl ester protects the carboxyl group of glutamic acid. This dual protection allows for selective deprotection and coupling during the synthesis process, enabling the precise assembly of complex peptides. It is widely applied in the development of pharmaceutical peptides, bioactive compounds, and research tools for studying protein interactions and functions.