Used in peptide synthesis as a protected amino acid derivative, it facilitates the controlled formation of peptide bonds. The Boc (tert-butoxycarbonyl) group protects the amino functionality, while the Phe(3,4-Cl2) moiety introduces a di-chlorinated phenylalanine residue into the peptide chain. This is particularly useful in creating peptides with specific structural or functional properties, such as enhanced stability or altered binding characteristics. It is commonly employed in pharmaceutical research for developing peptide-based drugs, where precise control over amino acid incorporation is critical. Additionally, it finds application in studying enzyme-substrate interactions and designing bioactive peptides with targeted therapeutic effects.