(S)-2-(1-(2-(2,3-Dihydrobenzofuran-5-yl)-2-oxoethyl)pyrrolidin-3-yl)-2,2-diphenylacetamide,(S)-2-(1-(2-(2,3-Dihydrobenzofuran-5-yl)-2-oxoethyl)pyrrolidin-3-yl)-2,2-diphenylacetamide,Impurity in commercial preparations of Darifenacin.,Darifenacin Impurity