Synonyms: 2-(((4-Methoxyphenyl)methylhydrazono)methyl)-1,3,3-trimethyl-3H-indolium sulphate (2:1);3H-Indolium, 2-(((4-methoxyphenyl)methylhydrazono)methyl)-1,3,3-trimethyl-, sulfate (2:1);1-(4-methoxyphenyl)-N-[(1,3,3-trimethylindol-1-ium-2-yl)methyleneamino]methanamine sulfate