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Acetonides are the only protecting groups used in the syntheses of isoDAB from d-ribose and of isoLAB from d-tagatose. isoDAB is a potent and highly specific competitive α-glucosidase inhibitor (for rice α-glucosidase, K i =4μM for isoDAB compared to K i 14μM for DAB). isoDAB is not an—whereas DAB is a potent—inhibitor of glycogen phosphorylase. This is the first example of any potent...