Cisatracurium Besylate EP Impurity A Catalogue B458331 CAS 1075727-06-8 M.W 587.68 M.F 30H37NO9S Specifications FAQs Synonyms: (1R,2R)-2-(2-carboxyethyl)-1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinolin-2-ium benzenesulfonate