Used in peptide synthesis as a protected amino acid derivative, particularly in the construction of bioactive peptides where arginine residues are required. The acetylated form helps block the N-terminus during stepwise assembly, preventing unwanted reactions. Commonly applied in research settings for developing pharmaceuticals, enzyme substrates, and receptor ligands. Its dihydrate form improves stability and handling in solid-phase peptide synthesis. Also utilized in studies involving protein mimetics and signal transduction pathways.