This chemical is primarily used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS) methods. It serves as a protected amino acid derivative, where the Fmoc (fluorenylmethyloxycarbonyl) group acts as a temporary protecting group for the amino group of leucine. The incorporation of the nitrogen-15 isotope (^15N) allows for applications in nuclear magnetic resonance (NMR) spectroscopy, enabling researchers to study peptide structures and dynamics with enhanced sensitivity and resolution. It is especially valuable in isotopic labeling studies for protein and peptide research, aiding in the understanding of molecular interactions, folding, and conformational changes. Additionally, it is utilized in the development of pharmaceuticals and bioactive peptides, where precise structural analysis is critical.