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(1R,4S,8R,9S,12R,13R,15R,17R)-3,14,14,17-Tetramethyl-9-triethylsilyloxy-10-trimethylsilyloxy-5,7-dioxapentacyclo[10.5.1.01,8.04,8.013,15]octadeca-2,10-diene-6,18-dione


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