1,3,3-Trimethyl-2-((methylphenylhydrazono)methyl)-3H-indolium hydrogen sulphate 3H-Indolium, 1,3,3-trimethyl-2-((methylphenylhydrazono)methyl)-, sulfate (1:1) 57303-65-8 65121-73-5 Diazenium, 1-methyl-1-phenyl-2-((1,3,3-trimethyl-2-indolinylidene)methyl)-, hydrogen sulfate EINECS 265-459-3