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(1R,2S,4S,6R,10S,11R,15S,17R)-15-Acetyl-1-hydroxy-4,17-dimethyl-8-methylidene-6-trimethylsilyloxy-12,14-dioxatetracyclo[8.7.0.02,6.011,15]heptadecane-5,13-dione


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