Used in peptide synthesis as a protected amino acid derivative, enabling selective coupling in the production of complex peptides. The Boc (tert-butoxycarbonyl) group acts as a temporary protecting group for the amine function, allowing controlled stepwise assembly of peptide chains. The 2-thienyl side chain provides a sterically and electronically unique environment, useful in tuning the biological activity or stability of synthetic peptides. Commonly applied in medicinal chemistry for developing peptide-based drugs, especially where aromatic or heterocyclic side chains influence receptor binding. Also employed in solid-phase and solution-phase synthesis due to its compatibility with standard coupling reagents and deprotection conditions.