1,3,3-Trimethyl-2-(2-(2-methyl-1H-indol-3-yl)ethenyl)-3H-indolium, bisulfate 3H-Indolium, 1,3,3-trimethyl-2-(2-(2-methyl-1H-indol-3-yl)ethenyl)-, sulfate (1:1) 72089-15-7