A cyclic sugar derivative used as a precursor in the synthesis of various compounds.
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(-)-5-O-benzyl-2,3-O-isopropylidene-D-ribono-1,4-lactone
<1S-(1α,4α,5α)>-1-<(Benzyloxycarbonyl)oxy>-3-<<(tert-butyldimethylsilyl)oxy>methyl>-4,5-(isopropylidenedioxy)-2-cyclopentene