6-Oxabicyclo[3.2.1]octan-8-one,3,4-bis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-1-[(1S)-2-ethenyl-1-hydroxy-2-methyl-3-butenyl]-5-methyl-2-(1-methylethenyl)-, (1R,2R,3R,4S,5R)-
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