(2S)-2-Amino-3-(1H-imidazol-4-yl)propanoic Acid; L-Histidine; (S)-Histidine; L-(-)-Histidine; (S)-4-(2-Amino-2-carboxyethyl)imidazole; (S)-a-Amino-1H-imidazole-4-propanoic Acid; (S)-1H-Imidazole-4-alanine; Glyoxaline-5-alanine;3-(1H-Imidazol-4-yl)-L-alanine (USP);