(S)-alpha,alpha-Diphenyl-3-pyrrolidineacetamine L-tartrate

darifenacin pyrrolidine impurity s-isomer ; darifenacin impurity a ; 3-(s)-(+)-(1-carbamoyl -1,1-diphenylmethyl)pyrroli ; darifenacin intermediate 5 ; (s)-α,α-diphenyl- ; 1-diphenylmethyl)pyrroloidine-l-(+)-tartarate ; 3-(s)-(+)-(1-carbamo ; (s)-α,α-diphenyl-3-pyrrolidineacetamide l-tartrate ; 3-(s)-(1-carbamoyl-1,1-diph ; darifenacin intermediate 8