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(1R,2R,3E,6R,7R,8S,9S,10R,13R,14R)-2,4,6,8,10,14-Hexamethyl-3,6-epoxy-7-[[(1R,2S,4R,6S)-4,7-dimethyl-8-oxo-3,9-dioxa-7-azabicyclo[4.3.0]nonane-2-yl]oxy]-9-[[(2R)-4alpha,6alpha-dimethyl-4-methoxy-5beta-hydroxytetrahydro-2H-pyran-2beta-yl]oxy]-13-ethyl-12,1


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