Avanafil Dimer Ester Impurity

Chemical Name: (1-(4-((3-chloro-4-methoxybenzyl)amino)-5-((pyrimidin-2-yl methyl)carbamoyl)pyrimidin-2-yl)pyrrolidin-2-yl)methyl 4-((3-chloro-4-methoxy benzyl)amino)-2-(2-(hydroxymethyl)pyrrolidin-yl)pyrimidine-5-carboxylate