Used as a key intermediate in the synthesis of pharmaceutical peptides, particularly in the production of protease inhibitors. It features a tert-butoxycarbonyl (Boc)-protected amino group and a free hydroxyl group on the tyrosine side chain, enabling selective coupling reactions and further modifications. This makes it valuable in solid-phase peptide synthesis. Commonly employed in the development of enzyme-targeted drugs, especially those addressing viral proteases such as HIV-1 protease inhibitors. The stereochemistry supports high specificity in biological activity, enhancing the efficacy of the final therapeutic compound.