Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 83-88-5, Whether you call it Riboflavin, Vitamin B2 or 7 -8-Dimethyl-10-(1-D-ribityl)isoalloxazine you can be assured the Riboflavin products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.