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[(1S,10R,11R,12R,17R)-3,10,14,14,17-Pentamethyl-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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