4-(ethyl(propyl)amino)but-2-yn-1-yl 2-cyclohexyl-2-hydroxy-2-phenylacetate,4-(ethyl(propyl)amino)but-2-yn-1-yl 2-cyclohexyl-2-hydroxy-2-phenylacetate,Oxybutynin impurity.;Impurity in commercial preparations of Oxybutynin,Oxybutynin
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