Used as a building block in peptide synthesis, particularly in the production of complex peptides and proteins. It is often employed in solid-phase peptide synthesis (SPPS) to introduce cysteine residues with protective groups, ensuring the correct formation of disulfide bonds. This chemical is crucial in the development of pharmaceuticals, including peptide-based drugs, and in research for studying protein structure and function. Its trityl (Trt) protection group allows for selective deprotection, making it valuable in sequential peptide assembly.