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In the title benzimidazolone, C 27 H 38 N 2 O 11 , which has  N -bound glycosidic units, all five-membered O-heterocyclic rings adopt envelope conformations [for the outer rings, the C atom with the dimethyl groups represents the flap atom]. The two glycosidic units are related by a non-crystallographic twofold rotation axis that passes through the carbonyl portion. In the mol­ecular structure, the hy­droxy groups are hydrogen-bond donors to the carbonyl O atom. Weak inter­molecular C—H⋯O hydrogen bonding is present in the crystal structure.

acta crystallographica. section e

1,3-Bis[2-hydroxy-2-(6-methoxy-2,2-dimethyl-3a,5,6,6a-tetrahydro-2H-furo[2,3-d][1,3]dioxol-5-yl)ethyl]-2,3-dihydro-1H-1,3-benzodiazol-2-one