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[(1S,5S,9R,10S,11R,15R,17R)-11-Hydroxy-3,10,14,14,17-pentamethyl-7,18-dioxo-6,8-dioxapentacyclo[10.5.1.01,5.05,9.013,15]octadec-2-en-4-yl] acetate


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