1H-Indolium, 1-((1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene)-2,3-dihydro-2-methyl-, acetate 2-(2-(2,3-Dihydro-2-methyl-1H-indol-1-yl)vinyl)-1,3,3-trimethyl-3H-indolium acetate 83949-78-4 EINECS 281-438-1