This chemical is widely used in peptide synthesis as a protected form of cysteine. The trityl (Trt) group acts as a protecting group for the thiol side chain, preventing unwanted reactions during peptide bond formation. It is particularly useful in solid-phase peptide synthesis (SPPS) to ensure selective deprotection and coupling steps. The hydrochloride (HCl) form enhances its stability and solubility, making it easier to handle in laboratory settings. This compound is essential for creating peptides that require precise cysteine incorporation, such as those involved in disulfide bond formation, which is critical for the structure and function of many proteins and bioactive peptides.