Widely used in peptide synthesis, this compound serves as a protected amino acid building block, particularly in solid-phase peptide synthesis (SPPS). Its Fmoc group enables reversible N-terminal protection, allowing stepwise assembly of peptides under mild basic conditions. The tert-butyl ester protects the carboxylic acid side chain, ensuring selective reactivity during coupling steps. Its stereochemistry supports the synthesis of structurally defined peptides, making it valuable in pharmaceutical research, especially for developing bioactive peptides and peptidomimetics.