Atracurium Impurity 37 Besylate Atracurium Impurity 27 Besylate AtracuriuM Besilate IMpurity C1 and C2 Iodide Atracurium Impurity 26 Besylate Atracurium Impurity 31 Besylate Atracurium Impurity 35 Besylate 1,5-pentanediyl bis[1-[(3,4-dimethoxyphenyl)methyl]-3,4-dihydro-6,7-dimethoxy-1H-isoquinoline-2-propionate] (1R,2R)-1-[(3,4-Dimethoxyphenyl)methyl]-2-[3-(tert-butoxy)-3-oxopropyl]-1,2,3,4-tetrahydro-6,7-dimethoxy-2-methylisoquinolinium benzenesulfonate Cisatracurium Besilate EP Impurity W Iodide (Mixture of Diastereomers) Cisatracurium Besilate EP Impurity N and O Iodide (Mixture of Diastereomers) Atracurium EP Impurity D Iodide (Mixture of Diastereomers) Atracurium Impurity 1 (R-trans, R-trans)-AtracuriuM Besylate PHENYL P-TOLYL SULFONE Atracurium EP Impurity K Iodide (Mixture of Diastereomers) Atracurium Impurity 15 Atracurium Impurity 19 AtracuriuM IMpurity A1 (trans-Monoquatenary)