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(S)-2-amino-3-(o-tolyl)propanoic acid; CAS No.: 80126-53-0; (S)-2-Amino-3-(o-tolyl)propanoic acid, an ortho-methyl phenylalanine, exemplifies our building blocks for sterically hindered peptide backbones. The methyl group prevents enzymatic degradation. As a chemical synthesis company, we deliver this amino acid for protease inhibitor research via enzymatic resolution.