19595-66-5 4-((4-(Dimethylamino)-3,5-xylyl)azo)pyridine 1-oxide N,N,2,6-Tetramethyl-4-(4'-(pyridyl-1'-oxide)azo)aniline Pyridine, 4-((4-(dimethylamino)-3,5-xylyl)azo)-, 1-oxide