Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 123-25-1, Whether you call it Diethyl Succinate, Butanedioic Acid Diethyl Ester , Ethyl Succinate or Succinic Acid Diethyl Ester you can be assured the Diethyl Succinate products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.