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The title compound, C 30 H 52 O 5 ·2H 2 O, was degraded from pseudoginsenoside F11 which was extracted and seperated from  Panax quinquefolium saponin . The three six-membered rings are in chair conformations. The five-membered ring is in an envelope conformation and the tetra­hydro­furan ring has a conformation inter­mediate between half-chair and envelope. In the crystal, inter­molecular O—H⋯O hydrogen bonds link mol­ecules into a three-dimensional network. Intra­molecular O—H⋯O hydrogen bonds also occur.

(3R,6R,12R,20S,24S)-20,24-Epoxydammarane-3,6,12,25-tetraol dihydrate