Diphenylmethyl)pyrroloidine-L-(+)-tartarate

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