Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 67-43-6, Whether you call it Diethylenetriaminepentaacetic Acid, (Carboxymethylimino)bis(ethylenenitrilo)tetraacetic Acid , DTPA or Pentetic Acid you can be assured the Diethylenetriaminepentaacetic Acid products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.