1,3,3-Trimethyl-2-((methyl(4-(phenylazo)phenyl)hydrazono)methyl)-3H-indolium methyl sulphate 2-((2-Methyl-2-(4-(phenylazo)phenyl)hydrazin-1-ylidene)methyl)-1,3,3-trimethyl-3H-indolium methyl sulfate 3H-Indolium, 1,3,3-trimethyl-2-((methyl(4-(phenylazo)phenyl)hydrazono)methyl)-, methyl sulfate 73019-04-2 EINECS 277-230-5