Fmoc-(S)-3-Amino-4-(2-naphthyl)-butyric acid is primarily used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). The Fmoc group serves as a protective group for the amino function, allowing for selective deprotection and coupling of amino acids during the synthesis process. The naphthyl side chain introduces hydrophobicity, which can be beneficial for enhancing the binding affinity of peptides to hydrophobic regions of target proteins. This compound is valuable in the development of peptide-based drugs, where specific interactions with biological targets are crucial. Additionally, it is employed in the study of peptide structure-activity relationships, aiding in the design of peptides with improved therapeutic properties. Its application extends to the synthesis of peptidomimetics, which mimic the structure and function of natural peptides, offering potential in drug discovery and development.