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 allow for selective peptide coupling and sequential elongation in solid-phase or solution-phase peptide synthesis. The branched aliphatic side chain enhances lipophilicity and influences conformational stability, making it valuable in optimizing drug candidates for improved metabolic stability and target binding. Commonly employed in the preparation of intermediates for antiviral and anticancer agents.