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2,2-Dimethyl-propionic acid (2R,3S,4R,5R,6R)-5-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-4-hydroxy-6-methoxy-3-[(2S,3R,4S,5S,6R)-3,4,5-triacetoxy-6-(2,2-dimethyl-propionyloxymethyl)-tetrahydro-pyran-2-yloxy]-tetrahydro-pyran-2-ylmethyl ester