(1,1'-Biphenyl)-4,4'-diethanaminium, N,N,N,N',N',N'-hexamethyl-beta,beta'-dioxo-, dibromide (9CI) 4,4'-Biphenylenebis(2-oxoethylene)bis(trimethylammonium) dibromide 7478-24-2 AMMONIUM, 4,4'-BIPHENYLENEBIS(2-OXOETHYLENE)BIS(TRIMETHYL-, DIBROMIDE NSC 402891