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Fagomine, 1-deoxynojirimycin (DNJ) and 1,4-dideoxy-1,4-imino-d-arabinitol (DAB) are the major bioactive constituents in the active fraction of alkaloids from the traditional Chinese medicine mulberry twig (Ramulus Mori, Chinese name Sang Zhi), which has a strong activity on α-glucosidase in vitro and in vivo.