Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of protease inhibitors and other bioactive molecules. Its protected amine and carboxylic acid functionalities make it ideal for peptide-like coupling reactions, allowing for selective and stepwise construction of complex organic structures. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies due to the stereochemical purity of the (R)-enantiomer, which can influence biological activity, metabolic stability, and binding affinity in drug candidates.