3-[1-Hydroxy-2-[2-[3-hydroxy-2-[6-[3-[5-(1-methoxyethyl)-3-methyloxolan-2-yl]but-1-enyl]-3-methyloxan-2-yl]prop-1-enyl]-6-methylcyclohexyl]propylidene]oxolane-2,4-dione