5-(N-(2-(2,3-dihydroxypropoxy)-3-hydroxypropyl)acetamido)-N1,N3-bis(2,3-dihydroxypropyl)-2,4,6-triiodoisophthalamide; 5-[Acetyl[2-(2,3-dihydroxypropoxy)-3-hydroxypropyl]amino]-N,N′-bis(2,3-dihydroxypropyl)-2,4,6-triiodobenzene-1,3-dicarboxamide; Iodixanol Impurity 4
