European Pharmacopoeia (EP) Reference Standard Synonym(s): 5-[Acetyl-[3-[acetyl[3-[[3-[3-[acetyl[3,5-bis-[(2,3-dihydroxypropyl)-carbamoyl]-2,4,6-triiodphenyl]-amino]-2-hydroxypropoxy]-2-hydroxypropyl]-carbamoyl]-5-[(2,3-dihydroxypropyl)-carbamoyl]-2,4,6-triiodphenyl]-amino]-2-hydroxypropyl]-amino]-...