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[(1S,5S,6R,7S,10R,12S,13S,15R,18S)-7-Hydroxy-13,17,20,20-tetramethyl-3,14-dioxo-12,18-bis(triethylsilyloxy)-2,4,9-trioxapentacyclo[14.3.1.01,5.06,13.07,10]icos-16-en-15-yl] acetate


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