Used in peptide synthesis as a protected amino acid derivative, enabling selective coupling reactions in the production of complex peptides. The Boc group provides temporary protection of the amino terminus, while the 4-NHZ protection on the phenylalanine side chain prevents unwanted side reactions during assembly. The DCHA (dicyclohexylamine) salt form enhances crystallinity and stability, facilitating purification and storage. Commonly applied in pharmaceutical research for developing bioactive peptides and optimizing synthetic routes in medicinal chemistry, including solid-phase peptide synthesis.