1,3,3-Trimethyl-2-((methyl(4-(phenylazo)phenyl)hydrazono)methyl)-3H-indolium hydrogen sulphate 3H-Indolium, 1,3,3-trimethyl-2-((methyl(4-(phenylazo)phenyl)hydrazono)methyl)-, sulfate (1:1) 83949-97-7 EINECS 281-454-9