This chemical is widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a protected form of cysteine, where the Fmoc (9-fluorenylmethoxycarbonyl) group protects the amino group, and the Trt (trityl) group protects the thiol side chain of cysteine. This protection is crucial to prevent unwanted reactions during the synthesis process. The compound is especially valuable in the production of peptides that require the incorporation of cysteine residues, which are essential for forming disulfide bonds that stabilize the peptide structure. Its use ensures high efficiency and purity in peptide assembly, making it a key reagent in the development of therapeutic peptides, research peptides, and other biologically active compounds.