Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 71-00-1, Whether you call it L-Histidine, L-2-Amino-3-(1H-imidazol-4-yl)propionic Acid , L-α or -Amino-4(or 5)-imidazolepropionic Acid you can be assured the L-Histidine products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.