2-Isopropenyl-4-isopropyl-1-methyl-1-vinylcyclohexane, didehydro derivative 68845-33-0 Cyclohexane, 1-ethenyl-1-methyl-2-(1-methylethenyl)-4-(1-methylethyl)-, didehydro deriv. EINECS 272-459-7 Elemene hydrocarbons