Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 123333-71-1, Whether you call it DL-Histidine Hydrochloride, Monohydrate or DL-alpha-Amino-Beta-(4-imidazolyl)propionic Acid Monohydrochloride you can be assured the products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.