4-((P-(dimethylamino)phenyl)azo)-3,5-lutidine-1-oxide ,with CAS number of 19456-77-0,can be called N,N-Dimethyl-4-(4'-(3',5'-dimethylpyridyl-1'-oxide)azo)aniline ; N,N-Dimethyl-4-(4'-(3',5'-lutidyl-1'-oxide)azo)aniline .