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2,2-Dimethyl-propionic acid (4S,5S)-5-((4aR,6S,7R,7aS)-2,2-dimethyl-7-triethylsilanyloxy-tetrahydro-furo[3,2-d][1,3]dioxin-6-yl)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl ester
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2,2-Dimethyl-propionic acid (4S,5S)-5-((4aR,6R,7R,7aS)-7-benzyloxy-2,2-dimethyl-tetrahydro-furo[3,2-d][1,3]dioxin-6-yl)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl ester