This compound is a protected derivative of (R)-aspartic acid, with a tert-butoxycarbonyl (Boc) group on the α-amino group and a fluorenylmethyl (Fm) ester on the side-chain carboxylic acid. It serves as a building block in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS), enabling the incorporation of aspartic acid residues with orthogonal protecting groups. The Boc group provides protection for the amino group, removable under acidic conditions (e.g., TFA), while the Fm ester protects the side chain, cleavable under basic conditions (e.g., piperidine). This allows selective deprotection and precise control during the assembly of complex peptide chains. It is essential for producing high-purity peptides in pharmaceutical research, drug development, and biochemical studies.