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We have isolated two novel a-glucosidase inhibitors, O-[4-deoxy-4-(2,3-epoxy-3-hydroxymethyl-4,5,6-trihydroxycyclohexane-1-yl-amino)-alpha-D-glucopyranosyl]-(1--&gt;4)-O-alpha-D-glucopyranosyl-(1--&gt;4)-alpha-D-glucopyranose (named CKD-711) and its hexameric analog CKD-711a, from the fermentation broth of Streptomyces sp. CK-4416. HRFAB-MS and NMR analyses reveal that molecular formulae of CKD-711 and CKD-711a are C25H43NO20 and C37H63NO30, respectively with the latter containing two more glucose moieties than the former. Detailed chemical structures of both compounds have been characterized by high-resolution two-dimensional NMR methods.

journal of antibiotics

Novel .ALPHA.-Glucosidase Inhibitors, CKD-711 and CKD-711a Produced by Streptomyces sp. CK-4416. III. Physico-chemical Properties and Structure Elucidation.