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3-O-Tert-butyl 5-O-[(1S,2S,3R,4S,7R,9S,10S,12R,15R,16S)-4,12-diacetyloxy-2-benzoyloxy-9-hydroxy-10,14,20,20-tetramethyl-11,18-dioxo-6,17,19-trioxapentacyclo[11.6.1.01,16.03,10.04,7]icos-13-en-15-yl] (4S,5R)-2-(2,4-dimethoxyphenyl)-4-(2-methylpropyl)-1,3-o


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