Synonyms: | Atracurium Impurity U;AtracuriuM Besylate iMpurity U;(1S,2R)-1-(3,4-dimethoxybenzyl)-2-(3-((5-((3-((1R,2S)-1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinolin-2-ium-2-yl)propanoyl)oxy)pentyl)oxy)-3-oxopropyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinolin-2-ium |