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[(1S,4S,5R,9R,12S,13R,15R,17R)-3,10,14,14,17-Pentamethyl-7,18-dioxo-6,8-dioxapentacyclo[10.5.1.01,5.05,9.013,15]octadeca-2,10-dien-4-yl] acetate


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