2,2€²-[Pentane-1,5-diylbis[oxy(3-oxopropane-3,1-diyl)]]bis[(1R,2S)-1-[(3,4-dimethoxyphenyl)methyl]-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinolinium] (as per EP);(1R,1€²R,2S,2€²S)-2,2€²-(3,11-Dioxo-4,10-dioxatridecamethylene)bis(1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-1-veratrylisoquinolinium) (as per USP):R-trans-R€²-trans-Atracurium;;;;,Cisatracurium Impurity