Bis-(2-brom-4-dimethylamino-phenyl)-methan;4,4'-methylenebis<m-bromo-N,N-dimethylaniline>;4,4'-methylene-bis(3-bromo-N,N-dimethylaniline);bis(2-bromo-4-(N,N-dimethylamino)phenyl)methane;4,4'-methylenebis(3-bromo-N,N-dimethylaniline);