N1-(3-(3-(N-(3,5-bis((2,3-dihydroxypropyl)carbamoyl)-2,4,6-triiodophenyl)acetamido)-2-hydroxypropoxy)-2-hydroxypropyl)-5-(N-(3-(N-(3,5-bis((2,3-dihydroxypropyl)carbamoyl)-2,4,6-triiodophenyl)acetamido)-2-hydroxypropyl)acetamido)-N3-(2,3-dihydroxypropyl)-2,4,6-triiodoisophthalamide
