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[(1S,5S,6R,10S,11S,13R)-11,15,18,18-Tetramethyl-7-methylidene-3,12,16-trioxo-10-triethylsilyloxy-2,4-dioxatetracyclo[12.3.1.01,5.06,11]octadec-14-en-13-yl] acetate


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