Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 302-79-4, Whether you call it Tretinoin, 15-apo-&#223, -caroten-15-oic Acid , Vitamin A Acid or all-trans-Retinoic Acid you can be assured the Tretinoin products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.