5-(Acetylamino)-N,N-bis(2,3-dihydroxypropyl)-2,4,6-triiodo-1,3-benzenedicarboxamide, 5-(Acetylamino)-N,N-bis(2,3-dihydroxypropyl)-2,4,6-triiodobenzene-1,3-dicarboxamide, 5-Acetylamino-N,N-bis(2,3-dihydroxypropyl)-2,4,6-triiodoisophthalamide, 5-Acetamido-N,N-bis(2,3-dihydroxypropyl)-2,4,6-triiodo-isophthalamide, Iohexol impurity A (EP), Iohexol Related Compound A (USP)