European Pharmacopoeia (EP) Reference Standard Synonym(s): 2,2'-[1,5-Pentanediylbis[oxy(3-oxo-3,1-propanediyl)]]bis[1-[3,4-dimethoxyphenyl)methyl]-1,2,3,4-tetrahydro-6,7-dimethoxy-2-methylisoquinolinium]dibenzenesulfonate; BW-33A; Tracrium Empirical Formula:...