(all-E)-3,7-Dimethyl-9-(2,6,6-trimethyl-1,3-cyclohexadien-1-yl)-2,4,6,8-nonatetraenal 3,4-Didehydroretinal 3-Dehydroretinal 3-Dehydroretinaldehyde 472-87-7 C05918 Dehydroretinal Dehydroretinaldehyd Dehydroretinaldehyde Retinene 2 Vitamin A2 aldehyde all-trans-3,4-Dehydroretinal all-trans-3-Dehydroretinal all-trans-Dehydroretinal alpha-Retinene trans-3-Dehydroretinal