Figure 5: High performance liquid chromatography chromatograms of three fractions obtained by high-speed counter-current chromatography preparation. (a) 1: 2,2-Dimethyl-6-acetylchromanone: (b) 2: tussilagone, (c) 3: 14-acetoxy-7 β-(3'-ethylcis-crotonoyloxy)-lα-(2'-methylbutyryloxy)-notonipetranone (80 mm × 80 mm)