Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 12758-40-6, Whether you call it Germanium Sesquioxide, Bis(2-carboxyethylgermanium)sesquioxide or Organic Germanium you can be assured the Germanium Sesquioxide products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.