title: (3R,6R,12R,20S,24S)-3,6,12-Triacetyl-20,24-ep-oxy-dammarane-3,6,12,25-tetra-ol.
abstract: 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 tetra-hydro-furan ring has a conformation inter-mediate between half-chair and envelope. In the crystal, mol-ecules 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.
authors.forename: Huan-Mei
authors.initials: HM
authors.lastname: Guo
authors.forename: Liang
authors.initials: L
authors.lastname: Wang
authors.forename: Nan
authors.initials: N
authors.lastname: Wang
authors.forename: Jiang-Feng
authors.initials: JF
authors.lastname: Zhang
authors.forename: Qing-Guo
authors.initials: QG
authors.lastname: Meng