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(1S,5S,9R,10R,11R,12R,13R,15R)-11-[Tert-butyl(dimethyl)silyl]oxy-3,10,14,14-tetramethyl-6,8-dioxapentacyclo[10.5.1.01,5.05,9.013,15]octadec-2-ene-7,18-dione


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