((6aR,6'aR,9R,9'R,10aS,10'aS)-10a,10'a-dimethoxy-4',7,7'-trimethyl-4',6a,6',6'a,7,7',8,8',9,9',10,10a,10',10'a-tetradecahydro-6H-[4,5'-biindolo[4,3-fg]quinoline]-9,9'-diyl)bis(methylene)bis(5-bromonicotinate),"[(6aR,6a'R,9R,9'R,10aS,10a'S)-9'-[[[(5-bromopyridin-3-yl)carbonyl]oxy]methyl]-10a,10a'-dimethoxy-4',7,7'-trimethyl-4',6',6a,6a',7,7',8,8',9,9',10,10',10a,10a'-tetradecahydro-6H-4,5'-biindolo[4,3-fg]quinoline-9-yl]methyl 5-bromopyridine-3-carboxylate",Nicergoline Impurity