Chemical Name: (1R,2R)-1-[(3,4-dimethoxyphenyl)methyl]-6,7-dimethoxy-2-(3-methoxy-3-oxopropyl)-2-methyl-1,2,3,4-tetrahydroisoquinolinium Chloride (as per EP); (1R,2R)-1,2,3,4-Tetrahydro-6,7-dimethoxy-2-[2-(methoxycarbonyl)ethyl]-2-methyl-1-veratrylisoquinolinium Chloride (as per USP)