A new epimer of ocotillol from stems and leaves of American ginseng

<div><p>A new minor C-3 epimer of ocotillol, named 3α-ocotillol (<b>1</b>), was isolated along with ocotillol (<b>2</b>) from the stems and leaves of American ginseng for the first time. The structure of the new sapogenin was elucidated as (20<i>S</i>, 24<i>R</i>)-dammar-20,24-epoxy-3α,6α,12β,25-tetraol by the combination analysis of NMR and mass spectrometry. The complete signal assignments of the two compounds were carried out by means of 2D NMR spectral analysis.</p></div>