1,1'-(1,1'-Biphenyl)-4,4'-diylbis(2-(1-piperidinyl)ethanone) dihydrobromide 123489-70-3 4,4'-Bis(piperidinoacetyl)biphenyl dihydrobromide Ethanone, 1,1'-(1,1'-biphenyl)-4,4'-diylbis(2-(1-piperidinyl)-, dihydrobromide