Fmoc-D-Arg(Boc)₂-OH is widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a protected form of D-arginine, ensuring the amino acid's side chain remains intact during the synthesis process. The Fmoc group protects the amino terminus, while the Boc groups shield the guanidine side chain, preventing unwanted reactions. This compound is essential for creating peptides with specific sequences, especially in pharmaceutical research and drug development. Its role is critical in producing peptides with high purity and accuracy, which are vital for studying biological processes and developing therapeutic agents.