This chemical is primarily used in peptide synthesis as a protected amino acid derivative. It serves as a building block in the construction of peptides, where the fluorenylmethoxycarbonyl (Fmoc) group acts as a protecting group for the amino functionality during the synthesis process. The methoxy and oxo groups on the butanoic acid moiety provide additional stability and reactivity control, making it suitable for solid-phase peptide synthesis (SPPS). Its application is crucial in the production of complex peptides and proteins for research, pharmaceuticals, and biotechnology.