1-deoxynojirimycin (DNJ), also called duvoglustat or moranolin.  1-deoxynojirimycin derived from Mulberry leaves, is a potent inhibitor of intestinal α-glycosidases, which acts as an antihyperglycemic agent by slowing the rate of carbohydrate degradation to monosaccharides. Deoxynojirimycin inhibits α-glucosidase I and II. Inhibits human immunodeficiency virus envelope glycoprotein-mediated membrane fusion at the CXCR4 binding step. May be used to produce an affinity ligand for purifying glucosidase 1. Deoxynojirimycin was used to inhibit ER glucosidases I and II allowing for the discovery of a second mechanism for deglucosylation of N-linked oligosaccharides in PhaR1.7, a mouse lymphoma cell line.