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Benzyl [(2S,3S,4R,6R)-6-[[(1R,2R,5R,6S,7S,8R,9R,11S,14S,15R)-2-ethyl-9-hydroxy-1,5,7,9,11,14-hexamethyl-8-[(2S,3R,4S,6R)-6-methyl-4-[methyl(phenylmethoxycarbonyl)amino]-3-phenylmethoxycarbonyloxyoxan-2-yl]oxy-4,13,17-trioxo-3,12,16,18-tetraoxabicyclo[13.3


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