Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 55268-74-1, Whether you call it Praziquantel or 2-(Cyclohexylcarbonyl)-1 -2 -3 -6 -7-11Beta-hexahydro-4H-pyrazino[2 -1-a]isoquinolin-4-one you can be assured the products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.