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Methyl 3-[(1S,5S,6R,9S,10S,12R,15S)-15-[tert-butyl(dimethyl)silyl]oxy-10,14,17,17-tetramethyl-3,7-dioxo-12-triethylsilyloxy-2,4,8-trioxatetracyclo[11.3.1.01,5.06,10]heptadec-13-en-9-yl]propanoate


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