Used in peptide synthesis as a protecting group for cysteine residues. The Fmoc group provides stability during the synthesis process, while the tBu group protects the thiol side chain from unwanted reactions. This compound is particularly useful in solid-phase peptide synthesis, enabling the production of complex peptides with high precision. It is widely applied in pharmaceutical research, biotechnology, and the development of therapeutic peptides. Its compatibility with automated peptide synthesizers makes it a valuable tool in modern peptide chemistry.