Used in peptide synthesis as a building block, particularly in solid-phase peptide synthesis (SPPS). It serves as a protected amino acid derivative, where the Fmoc (fluorenylmethyloxycarbonyl) group protects the amino group during the coupling process. This compound is especially valuable in creating peptides with non-natural amino acids, as it introduces norleucine, an analog of methionine, which can enhance stability and study protein interactions. It is widely applied in pharmaceutical research, biotechnology, and the development of therapeutic peptides.