Chemical Name: 2,2′-[Pentane-1,5-diylbis[oxy(3-oxopropane-3,1-diyl)]]bis[(1R,2R)-1-[(3,4-dimethoxyphenyl)methyl]-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinolinium] (as per EP);(1R,2R)-2-(2-Carboxyethyl)-1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-1-veratrylisoquinolinium, pentamethylene ester (as per USP)