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Methyl (1R,3S,7S,10R,13S)-7-[[tert-butyl(diphenyl)silyl]oxymethyl]-10-methyl-5,9-dioxo-16-propan-2-yl-4,6-dioxatetracyclo[8.7.0.03,7.013,17]heptadec-16-ene-13-carboxylate


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