Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 58-32-2, Whether you call it Dipyridamole or 2 -2 -2 -2-[(4 -8-Dipiperidinopyrimido[5 -4-d]pyrimidine-2 -6-diyl)dinitrilo]tetraethanol you can be assured the products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.