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

The title compound, C30H52O5·2H2O, 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.