Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 56602-33-6, Whether you call it Benzotriazol-1-yloxytris(dimethylamino)phosphonium Hexafluorophosphate, BOP or Castro's Reagent you can be assured the Benzotriazol-1-yloxytris(dimethylamino)phosphonium Hexafluorophosphate products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.