Carbon-nitrogen and carbon-sulfur linked pseudodisaccharides incorporating an hydroxylated pyrrolidine type glucosidase inhibitor have been prepared. These new azasugar-containing disaccharides result from the nucleophilic opening of D-mannitol derived bis-aziridines either by 3-deoxy-3-amino-D-glucose or by 3-deoxy-3-thio-D-glucose. Copyright (C) 1996 Published by Elsevier Science Ltd