Used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS) as a building block. It helps introduce the non-natural amino acid D-homocitrulline into peptide chains, which is valuable in studying peptide structure and function. Its Fmoc protecting group allows for selective deprotection during synthesis, ensuring precise control over peptide assembly. Commonly applied in pharmaceutical research for developing peptide-based drugs and in biochemical studies to explore protein interactions and modifications.