Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 2646-17-5, Whether you call it Solvent Orange 2, Daidai403 , Orange OT or 1-(o-Tolylazo)-2-naphthol you can be assured the Solvent Orange 2 products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.