19456-73-6 4-((4-(Dimethylamino)-2,3-xylyl)azo)pyridine 1-oxide Benzenamine, N,N,2,3-tetramethyl-4-(4-pyridinylazo)-, N-oxide (9CI) N,N,2,3-Tetramethyl-4-(4'-(pyridyl-1'-oxide)azo)aniline NSC 170587 Pyridine, 4-((4-(dimethylamino)-2,3-xylyl)azo)-, 1-oxide