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The title compound, C 36 H 58 O 8 , was prepared from 20( S )-protopanaxatriol, which was degraded from  Panax quinquefolium saponin  with sodium in glycerine, extracted and seperated by flash chromatography. Three six-membered rings are in chair conformations, the five-membered ring is in an envelope form and the tetra­hydro­furan ring has a conformation inter­mediate between half-chair and envelope. In the crystal, mol­ecules are linked by O—H⋯O hydrogen bonds, and C—H⋯O contacts also occur. The absolute structure was assigned on the basis of the synthesis.

(3R,6R,12R,20S,24S)-3,6,12-Triacetyl-20,24-epoxydammarane-3,6,12,25-tetraol