Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 553-12-8, Whether you call it Protoporphyrin IX or 8 -13-Divinyl-3 -7 -12 -17-tetramethyl-21H -23H-porphine-2 -18-dipropionic Acid you can be assured the products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.