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(1R,2R)-2-(2-carboxyethyl)- AtracuriuM Besylate iMpurity A Atracurium Impurity D Besylate Cisatracurium Besylate EP Impurity A Cisatracurium EP Impurity A Besylate Cisatracurium Besilate EP Impurity A Iodide (R-cis-N-Methyl-N-Alkyl-(Acid)-tetrahydropapaverine) besylate Atracurium Impurity 4 Iodide（Cisatracurium Besilate EP Impurity A Iodide） (1R,2R)-2-(2-Carboxyethyl)-1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoqu 2-(2-carboxyethyl)-1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinolin-2-ium benzenesulfonate 2-(2-carboxyethyl)-1-[(3,4-dimethoxyphenyl)methyl]-,1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-isoquinolinium benzenesulfonate (1R,2R)-2-(2-Carboxyethyl)-1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinolin-2-ium benzenesulfonate