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6-[(2R,3R,4R,5S,6R)-4-((4aR,6R,7R,8S,8aS)-7,8-Bis-benzyloxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-6-yloxy)-6-(tert-butyl-diphenyl-silanyloxymethyl)-3-hydroxy-5-(4-oxo-pentanoyloxy)-tetrahydro-pyran-2-yloxy]-hexanoic acid methyl ester