(4-(1-Methyl-3-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2-propenylidene)-2-cyclohexen-1-ylidene)acetaldehyde 10,20-Methanoretinal 128434-80-0 Acetaldehyde, (4-(1-methyl-3-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2-propenylidene)-2-cyclohexen-1-ylidene)-