This chemical is primarily used in peptide synthesis as a protected amino acid derivative. It serves as a building block for creating complex peptides, particularly in solid-phase peptide synthesis (SPPS). The fluorenylmethoxycarbonyl (Fmoc) group acts as a protecting group for the amine functionality, ensuring selective reactions during peptide chain assembly. Its application is crucial in the development of pharmaceuticals, bioactive peptides, and research involving protein engineering. The phenylbutanoic acid moiety contributes to the structural diversity of synthesized peptides, making it valuable in designing compounds with specific biological activities.