Polyhydroxylated pyrrolidine compound as well as preparation method and application thereof

The invention relates to the field of glycosidase inhibitors and particularly relates to a polyhydroxylated pyrrolidine compound as well as a preparation method and application thereof. The structure of the polyhydroxylated pyrrolidine compound is as shown in formula (I). The polyhydroxylated pyrrolidine compound has high glycosidase inhibition activity and has a potential medicinal value. The formula is as shown in description.