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(S)-2-amino-3-(4-hydroxy-3-nitrophenyl)propanoic acid; CAS No.: 621-44-3; (S)-2-Amino-3-(4-hydroxy-3-nitrophenyl)propanoic acid, a nitrotyrosine analog, underscores our building blocks for drug discovery targeting neurodegenerative diseases. The hydroxyl and nitro groups mimic oxidative stress biomarkers. As a custom chemical synthesis company, we deliver enantiopure amino acids via asymmetric hydrogenation, enabling peptide-based therapeutic development. Rigorous chiral HPLC validation ensures >99% ee, critical for preclinical studies in Alzheimer s and Parkinson s research.