Studies on the chemical constituents of Panax quinquefolius Linn.

From Panax quinquefolius Linn cultivated in Liaoning province (China) sixteen compounds (1～16) were isolated. The structures of these compounds were identified as palmitie acid(1), oleanolic acid(2), daucosterin(3), ginsenosides-Rh1, -Rg3, -Rg2, -Rg1, -Rf, -Re, -Rd, -Rb2, -Rb1, -Re (4-13), sucrose(14), ginsengtrisaccharide(15) and a new saponin whose structure was elucidated to be 20 (S)-protopanaxadiol 3-O-β-D-glueopyranosyl-(1→2)-β-D-glucopyranosyl-(1→2)-β-D-glucopyranoside, 20-O-β-D-glucopyranosyl-(1→6)-β-D-glucopynoside(16) on the basis of IR, Mass spectra (FD-MS, FAB-MS), ~(13)C-NMR and chemical evidences. The new saponin was named ginsenoside-RA_o.