This compound is primarily used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a protected cysteine derivative, where the Fmoc (fluorenylmethyloxycarbonyl) group protects the amino group, and the Boc (tert-butyloxycarbonyl) group protects the side chain amino group. This dual protection ensures selective deprotection during peptide chain assembly, allowing for the precise incorporation of cysteine residues into peptides. It is especially useful in synthesizing peptides with specific disulfide bond patterns, which are crucial for the structural integrity and biological activity of many peptides and proteins. Additionally, its application extends to the development of peptide-based drugs, biomaterials, and research tools in biochemistry and molecular biology.