(R)-Boc-4-Chlorophenyl-β-phenylalanine is a chiral, non-natural amino acid derivative. Its structure features a β-phenylalanine backbone with a 4-chlorophenyl substituent at the β-position and a tert-butoxycarbonyl (Boc) protecting group on the amine functionality. This compound is characterized by its specific (R)-configuration at the chiral center. This building block is primarily employed in the synthesis of peptide-based pharmaceuticals and bioactive molecules. The presence of the Boc group facilitates its use in solid-phase peptide synthesis (SPPS) and other stepwise coupling strategies. The chlorophenyl and phenyl side chains are designed to impart specific hydrophobic interactions and binding properties to the final peptide or peptidomimetic, making it valuable for drug discovery programs targeting protein-protein interactions, enzyme inhibitors, or receptor modulators. As a chiral intermediate, it is crucial for constructing stereochemically defined peptide sequences. Its utility extends to the development of potential therapeutic agents where precise spatial arrangement is essential for biological activity and metabolic stability.