Chemical structures and HPLC analysis of ginsenosides in American ginseng extract. The structures of determined ginsenosides are shown in (A). HPLC chromatogram of American ginseng extract recorded at 202 nm is shown in (B). HPLC conditions are described in the Materials and Methods. Nine ginsenosides were determined. Ginsenosides (peak numbers) in the chromatogram: Rg1 (1), Re (2), Rh1 (3), Rg2 (4), Rb1 (5), Rc (6), Rb2 (7), Rb3 (8) and Rd (9).