1,1'-(1,1'-Biphenyl)-4,4'-diylbis(2-(1-pyrrolidinyl)ethanone) dihydrobromide 123489-65-6 4,4'-Bis(pyrrolidinoacetyl)biphenyl dihydrobromide Ethanone, 1,1'-(1,1'-biphenyl)-4,4'-diylbis(2-(1-pyrrolidinyl)-, dihydrobromide