Figure 5

Possible schemes of conversion of flavonoid glycoside malonates to their related flavonoid glycoside and flavonoid during reflux extraction of Radix Astragali. (1) Calycosin-7-O-β-D-glucoside, (2) Calycosin-7-O-β-D-glucoside-6"-O-malonate, (3) Ononin, (4) (6aR,11aR)-3-Hydroxy-9,10-dimeth-oxypterocarpan-3-O-β-D-glucoside, (5) (3R)-7,29-Dihydroxy-39,49-dimethoxy-isoflavan-7-O-β-D-glucoside, (6) Calycosin, (7) Formononetin-7-O-b-D-glucoside-6"-O-malonate, (8) Astrapterocarpanglucoside-6"-O-malonate, (9) Formononetin, (10) (6aR,11aR)-3-Hydroxy-9,10-dimeth-oxypterocarpan.