(6Z)-6-(3-Methoxybutylidene)-1,5,5-trimethyl-cyclohexene 4-(2,6,6-trimethyl-2-cyclohexen-1-ylidene)-butan-2-methoxy retro-Methoxy-α-ionol retro-Methyl-α-ionol retro-Methoxy-a-ionol 4-(2,6,6-trimethyl-2-cyclohexen-1-ylidene)-2-methoxybutane Cyclohexene, 6-(3-methoxybutylidene)-1,5,5-trimethyl-, (6Z)-