Used as an intermediate in peptide synthesis and pharmaceutical research, particularly in the development of tyrosine-based compounds. It serves as a protected form of tyrosine, where the acetyl group stabilizes the amino acid during coupling reactions and the methyl ester protects the carboxyl group. This makes it valuable in solid-phase peptide synthesis and in creating bioactive molecules that require modified tyrosine residues. Its hydrochloride salt form enhances solubility and stability in various reaction conditions. Commonly applied in the production of diagnostic agents, enzyme substrates, and experimental therapeutics involving protein modulation.