5,5'-(Suberoyldiimino)bis[2,4,6-triiodo-3-(propylcarbamoyl)benzoic acid]

3-[7-[[3-carboxy-2,4,6-triiodo-5-(propylcarbamoyl)phenyl]carbamoyl]heptanoylamino]-2,4,6-triiodo-5-(propylcarbamoyl)benzoic acid