1,3,3-Trimethyl-2-(2-(2-methyl-3H-indol-3-yl)vinyl)-3H-indolium hydrogen sulphate 3H-Indolium, 1,3,3-trimethyl-2-(2-(2-methyl-3H-indol-3-yl)ethenyl)-, sulfate (1:1) 68845-14-7 EINECS 272-451-3