Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 83-43-2, Whether you call it Methylprednisolone, 6alpha-Methylprednisolone or 11Beta -17alpha -21-Trihydroxy-6alpha-methylpregna-1 -4-diene-3 -20-dione you can be assured the Methylprednisolone products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.