This chemical is primarily used in peptide synthesis as a protected amino acid derivative. It serves as a building block for constructing peptides in solid-phase peptide synthesis (SPPS) methods. The fluorenylmethoxycarbonyl (Fmoc) group attached to the amino acid acts as a protective group, preventing unwanted reactions during the peptide chain assembly. It is particularly valuable in synthesizing complex peptides and proteins for research, pharmaceuticals, and biotechnology applications. The phenylbutanoic acid structure also contributes to its stability and efficiency in peptide bond formation. After the peptide synthesis is complete, the Fmoc group can be easily removed under mild conditions, making it a versatile and widely used reagent in organic and peptide chemistry.