Iodixanol Related Compound E – 5-[[3-[[3-[[(2,3-Dihydoxypropyl)amino]carbonyl]-5-[[amino]carbonyl]-2,4,6-triiodophenyl](acetylimino)]-2-hydroxypropyl]-(acetylimino)]-N,N’-bis(2,3-dihydoxypropyl)-2,4,6-triiodo-1,3-benzenedicarboxamide