Bicyclo[2.2.2]oct-5-en-2-ol, 8-[(1R)-1-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-2-methylpropyl]-2 -[(1E,3S)-4-[(4-methoxyphenyl)methoxy]-3-methyl-1-butenyl]-1-methyl-, (1S,2R,4S,8R)-