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[(1S,4S,5S,9R,11R,12R,13R,15R)-3,14,14-Trimethyl-7,18-dioxo-11-(trifluoromethylsulfonyloxy)-6,8-dioxapentacyclo[10.5.1.01,5.05,9.013,15]octadec-2-en-4-yl] acetate


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