3-[(1R,4aR,5S,6S,8aR)-5,8a-dimethyl-2-methylene-5-(2-oxoethyl)-6-(triethylsiloxy)decahydronaphthalen-1-yl]methyl-2-methoxy-5,6-dimethyl-4H-pyran-4-one

3-{(1R,4aR,5S,6S,8aR)-5-[(R)-2-hydroxy-4-methylpent-3-enyl]-5,8a-dimethyl-2-methylene-6-(hydroxy)decahydronaphthalen-1-yl}methyl-2-methoxy-5,6-dimethyl-4H-pyran-4-one