Used as a key intermediate in the synthesis of protease inhibitors, particularly in the development of antiviral drugs such as those targeting hepatitis C virus (HCV). Its chiral structure and protected functional groups make it valuable in asymmetric synthesis, enabling precise construction of complex peptide-like frameworks. The diphenylmethyl thioether moiety enhances lipophilicity and aids in purification through crystallization, while the Boc-protected amine allows for selective deprotection and further coupling in multi-step peptide syntheses. Commonly employed in medicinal chemistry for building blocks requiring high stereochemical purity.