Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of targeted drug conjugates and prodrugs. Its carboxylic acid and protected amine functionalities allow for selective coupling reactions, enabling the attachment of active drug molecules to delivery systems or biomolecules. Commonly employed in solid-phase peptide synthesis and medicinal chemistry for constructing complex molecules with improved bioavailability and specificity. Also utilized in the preparation of enzyme inhibitors and receptor modulators due to its structural versatility and stability under various reaction conditions.