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Tert-butyl [(1R,2R,5R,6S,7R,8R,9R,11S,12R,13R,14R)-8-[(2S,3R,4S,6R)-4-(dimethylamino)-6-methyl-3-triethylsilyloxyoxan-2-yl]oxy-2-ethyl-11-fluoro-9-hydroxy-1,5,7,9,11,13-hexamethyl-4,16-dioxo-6-triethylsilyloxy-3,15,17-trioxabicyclo[12.3.0]heptadecan-12-yl


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