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碘帕醇雜質B（5-[(羥乙?；?氨基]-N,N’-雙[2-羥基-1-（羥甲基）乙基]-2,4,6-三碘苯-1,3-二甲酰胺）Iopamidol Impurity B(5-[(hydroxyacetyl)amino]-N,N’-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-2,4,6-triiodobenzene-1,3-dicarboxamide)