European Pharmacopoeia (EP) Reference Standard Synonym(s): 5-Amino- N , N '-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-2,4,6-triiodobenzene-1,3-dicarboxamide; N , N '-Bis[2-hydroxy-1-(hydroxymethyl)ethyl]-5-amino-2,4,6-triiodoisophthalamide Empirical Formula:...