Lack of glycosidase inhibition by, and isolation from xanthocercis zambesiaca (leguminosae) of, 4-O-(β-D-glucopyranosyl)-fagomine [1,2,5-trideoxy-4-O-(β-D-glucopyranosyl)-1,5-imino-D- arabino-hexitol], a novel glucoside of a polyhydroxylated piperidine alkaloid

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