United States Pharmacopeia (USP) Reference Standard Synonym(s): 5-(Acetylamino)- N , N' -bis(2,3-dihydroxypropyl)-2,4,6-triiodo-1,3-benzenedicarboxamide; 5-Acetylamino- N , N '-bis(2,3-dihydroxypropyl)-2,4,6-triiodoisophthalamide Empirical Formula:...