Used in peptide synthesis, it serves as a protecting group for amino acids, specifically D-leucine, ensuring selective reactions during the formation of peptide bonds. Its application is crucial in solid-phase peptide synthesis (SPPS), where it helps in building complex peptides with high precision. The Fmoc group can be easily removed under mild basic conditions, making it ideal for synthesizing sensitive peptides. It is widely employed in pharmaceutical research, particularly in developing therapeutic peptides and studying protein interactions.