Synonyms: Benzenamine,N,N-dimethyl-4-(4-pyridinylazo)-, N4-oxide; Benzenamine,N,N-dimethyl-4-[(1-oxido-4-pyridinyl)azo]- (9CI); Pyridine,4-(p-dimethylaminophenylazo)-, oxide (6CI); Pyridine,4-[[p-(dimethylamino)phenyl]azo]-, 1-oxide (7CI,8CI); NSC 170631