Used as an amino-protected linker in peptide synthesis, particularly in solid-phase applications where controlled coupling and deprotection are required. Its Boc-protected amine and carboxylic acid terminus allow stepwise assembly of peptide chains, enabling the introduction of spacers or functional handles in bioconjugation. Commonly employed in the preparation of peptide-drug conjugates, labeled peptides, and diagnostic probes due to its stability under standard synthesis conditions and selective deprotection with mild acid. Also utilized in the development of bifunctional molecules for targeted delivery and biochemical assays.