5-Amino-N,N'-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-2,4,6-triiodo-1,3-benzenedicarboxamide-d8 is the isotope labelled analog of 5-Amino-N,N'-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-2,4,6-triiodo-1,3-benzenedicarboxamide. 5-Amino-N,N'-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-2,4,6-triiodo-1,3-benzenedicarboxamide is an impurity in the synthesis of Iopamidol (I735600), a nonionic radiocontrast medium. Diagnostic aid (radiopaque medium).