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(1R,2R,5R,6S,7S,8R,9R,11R,13R,14R)-8-[[(3Ar,4S,6R,7aS)-6-methyl-2-oxo-1,3a,4,6,7,7a-hexahydropyrano[4,3-d][1,3]oxazol-4-yl]oxy]-2-ethyl-6-[(2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl]oxy-9-methoxy-1,5,7,9,11,13-hexamethyl-3,15,17-trioxabicyclo


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