Used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of targeted therapies such as kinase inhibitors. Its structure allows for selective modification in drug design, enabling improved binding to specific biological targets. Commonly employed in solid-phase peptide synthesis and bioconjugation due to the presence of both carboxylic acid and protected amine functionalities. Also utilized in the preparation of prodrugs and antibody-drug conjugates (ADCs) where controlled activation and stability are required.