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(1S,5S,6R,7S,8S,10S,12S,14S,17S)-17-[Tert-butyl(dimethyl)silyl]oxy-7-hydroxy-7,12,16,19,19-pentamethyl-14-triethylsilyloxy-2,4,9-trioxapentacyclo[13.3.1.01,5.06,12.08,10]nonadec-15-en-3-one


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