Cisatracurium Besylate EP Impurity C Catalogue B458333 CAS 85-63-2 M.W 357.44 M.F C21H27NO4 Specifications FAQs Synonyms: (R)-1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinoline