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Methyl (1S,5S,6R,10S,11S,13R,16S)-16-[tert-butyl(dimethyl)silyl]oxy-7,10-dihydroxy-11,15,18,18-tetramethyl-3-oxo-13-triethylsilyloxy-2,4-dioxatetracyclo[12.3.1.01,5.06,11]octadeca-7,14-diene-8-carboxylate


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