Used as an intermediate in peptide synthesis, particularly in solid-phase and solution-phase methods, where it serves to protect amine functionalities while allowing selective deprotection and chain elongation. Its tosylate group enables efficient displacement by nucleophiles, facilitating the introduction of functionalized linkers or labels in bioconjugation strategies. Commonly employed in the preparation of complex biomolecules, including modified peptides and peptidomimetics, for pharmaceutical and biochemical research.