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(1R,2R,4S,8R,9S,11S,13R,15S,17S)-4-Acetyl-11-(hydroxymethyl)-2,15-dimethyl-13-trimethylsilyloxy-5,7,18-trioxapentacyclo[9.6.1.01,9.04,8.013,17]octadecane-6,14-dione


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