The chemical L-Histidine has a designated molecular formula of C6H9N3O2 and a molecular weight of 155.157 g/mol. Synonyms may include: Histidine, AI3-26558, L-Alanine, 3-(1H-imidazol-4-yl)-, (S)-4-(2-Amino-2-carboxyethyl)imidazole, 4-(2-Amino-2-carboxyethyl)imidazole, (S)-alpha-Amino-1H-imidazole-4-propanoic acid, alpha-Amino-1H-imidazole-4-propionic acid, (S)-, alpha-Amino-4(or 5)-imidazolepropionic acid, Anti-rheuma (ChemID).