(Z)-(4aS,5S,6S,8aS)-5-allyl-2-hydroxymethylene-5,8a-dimethyl-6-(triethylsiloxy)decahydronaphthalen-1-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

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