This chemical is primarily used in peptide synthesis as a protecting group for cysteine residues. The fluorenylmethoxycarbonyl (Fmoc) group shields the amino group, while the thiol group remains reactive for further modifications. It is particularly valuable in solid-phase peptide synthesis, where controlled deprotection and coupling are essential for constructing complex peptides. The compound’s stability under basic conditions allows for selective removal of the Fmoc group without affecting the thiol functionality. This makes it a crucial reagent in the production of peptides for pharmaceutical research, drug development, and biochemical studies.