Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 2440-22-4, Whether you call it Drometrizole, 2-(2-Benzotriazole)-p-cresol, Drometrizole or 2-(2-Hydroxy-5-methylphenyl)benzotriazole you can be assured the Drometrizole products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.