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Methyl (4R,5S)-2,2,5-trimethyl-1,3-dioxolane-4-carboxylate 2,3-O-Isopropylidene-D-ribonic gamma-lactone 2,3-O-ISOPROPYLIDENE-D-ERYTHRONOLACTONE 5-BROMO-5-DEOXY-2,3-O-ISOPROPYLIDENE-D-RIBONOLACTONE (4R,5R)-4,5-DIETHOXYCARBONYL-2,2-DIMETHYL DIOXOLANE 5-O-(TERT-BUTYLDIMETHYLSILYL)-2,3-O-ISOPROPYLIDENE-D-RIBONIC ACID GAMMA-LACTONE