Nicergoline EP Impurity I

Chemical Name: [(6aR,6a′R,9R,9′R,10aS,10a′S)-9′-[[[(5-bromopyridin-3-yl)carbonyl]oxy]methyl]-10a,10a′-dimethoxy-7,7′-dimethyl-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