It was proved that the genuine sapogenin of ginsenosides-Rb1, -Rb2, and -Rc, saponins of Ginseng roots, was represented by protopanaxadiol (IVa), and panaxadiol (I) was an artifact formed during the process of the acid hydrolysis of these saponins.
No takes yet. Share an insight, caveat, or question.
Shibata et al. (1966) studied this question.