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(1S,4S,8R,10R,11R,12R,13R,15R,17R)-11-[Tert-butyl(dimethyl)silyl]oxy-3,10,14,14,17-pentamethyl-5,7-dioxapentacyclo[10.5.1.01,8.04,8.013,15]octadec-2-ene-6,18-dione


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