Synonyms: 3H-IndoliuM, 2-[2-(4-hydroxy-3,5-diiodophenyl)ethenyl]-3,3-diMethyl-1-(3-sulfopropyl)-, inner salt;2-[2-(4-Hydroxy-3,5-diiodophenyl)ethenyl]-3,3-dimethyl-1-(3-sulfopropyl)-3H-indolium inner salt;3H-IndoliuM, 2-[2-(4-hydroxy-3,5-diiodophenyl)ethenyl]-3,3-diMethyl-1-(3-;3-(2-(4-Hydroxy-3,5-diiodostyryl)-3,3-dimethyl-3H-indol-1-ium-1-yl)propane-1-sulfonate