Used as an intermediate in peptide synthesis and pharmaceutical manufacturing, particularly in the preparation of protected amino acids for solid-phase peptide coupling. Its carboxylic acid and amine-protected functional groups allow selective reactions in multi-step organic syntheses. Commonly employed in the production of bioactive molecules, including drug candidates requiring precise side-chain modifications. Also utilized in the development of antibody-drug conjugates and other targeted therapeutics due to its stability and reactivity profile under mild conditions.