2-(3-(1,3-Dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)prop-1-enyl)-1,3,3-trimethyl-3H-indolium formate 3H-Indolium, 2-(3-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1-propenyl)-1,3,3-trimethyl-, formate 83950-17-8 EINECS 281-470-6