Fmoc-(R)-3-amino-4-(4-biphenyl)butanoic acid is primarily used in peptide synthesis as a building block. Its Fmoc group protects the amine functionality during the synthesis process, ensuring selective reactions at other sites. This compound is particularly valuable in the preparation of peptides with specific structural or functional properties, often employed in drug discovery and development. Its biphenyl moiety can contribute to enhancing the peptide's interaction with biological targets, making it useful in designing bioactive molecules or inhibitors. Additionally, it finds application in the study of protein-protein interactions and the development of peptide-based therapeutics.