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Synthesis of 3″-deoxy and 4″-deoxy Lewisx trisaccharides is described.Phenyl 2,3,6-tri-O-benzoyl-4-deoxy-1-thio-β-Dxylo-hexopyranoside was condensed with a diol of glucosamine to give regio-and stereo-selectively a disaccharide.Stereose-lective fucosylati