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(1S,3S,7R,8S,9R,10S,12S,13R,15R,17R)-8,9-Dihydroxy-3,14,14,17-tetramethyl-10-triethylsilyloxy-4,6-dioxapentacyclo[10.5.1.01,8.03,7.013,15]octadecane-5,18-dione


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