Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 5306-85-4, Whether you call it Isosorbide Dimethyl Ether, 1 -4:3 -6-Dianhydrosorbitol 2 -5-Dimethyl Ether or Dimethyl Isosorbide you can be assured the Isosorbide Dimethyl Ether products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.