(1,1'-Biphenyl)-4,4'-diethanaminium, N,N,N',N'-tetrakis(2-ethoxyethyl)-N,N'-dimethyl-beta,beta'-dioxo-, dibromide 37750-85-9 4,4'-Bis(N,N-di(2-ethoxyethyl)-N,N-dimethylammonioacetyl)biphenyl 4,4'-Bis-(N,N-di(2-ethoxyethyl)-N,N-dimethylammonioacetyl)biphenyl dibromide