Used in pharmaceutical synthesis as an intermediate for protease inhibitors, particularly in the development of antiviral drugs. Its structure supports selective binding to enzyme active sites, making it valuable in designing inhibitors for viruses such as hepatitis C and HIV. The protected amine and carboxylic acid functionalities allow for stepwise peptide coupling and modification in multi-step synthetic routes. Commonly employed in research settings for optimizing drug candidates requiring high stereochemical purity and specific side-chain interactions.