(1R,2R,3S,4S,5R)-1-O-mesyl-2-O-benzyl-3,4-O-isopropylidene-5-acetoxymethyl-cyclopentane-1,2,3,4-tetrol

(1R,2S,3S,4S,5S)-2-O-benzyl-3,4-O-isopropylidene-5-(2-O-tert-butyldimethylsilyl-hydroxyethyl)-cyclopentane-1,2,3,4-tetrol