This chemical is primarily used in peptide synthesis as a protected form of aspartic acid. The tert-butyl ester group (OtBu) protects the carboxylic acid side chain, while the methyl ester (OMe) protects the alpha-carboxyl group, allowing selective deprotection during the synthesis process. It is particularly valuable in solid-phase peptide synthesis (SPPS) and solution-phase peptide synthesis, where controlled assembly of amino acids is required. The hydrochloride salt form enhances its stability and solubility in various solvents, making it easier to handle in laboratory settings. Its applications extend to the production of pharmaceuticals, bioactive peptides, and research into protein structure and function.