38815-69-9 NSC224861 Poly([4,4'-bipyridinium]-1,1'-diylmethylene-1,4-phenylenemethylene dibromide Poly([4,4'-bipyridinium]-1,1'-diylmethylene-1,4-phenylenemethylene dibromide) Poly[(4,4'-bipyridinium)-1,1'-diylmethylene-1,4-cyclohexanediylmethylene]