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Acetic acid (2R,3R,4S,6S)-3-acetoxy-6-{(2R,3R,4S,6S)-4-(tert-butyl-dimethyl-silanyloxy)-6-[(2R,3R,4S)-4-(tert-butyl-dimethyl-silanyloxy)-2-methyl-3,4-dihydro-2H-pyran-3-yloxy]-2-methyl-tetrahydro-pyran-3-yloxy}-2-methyl-tetrahydro-pyran-4-yl ester