Fig 1. Chemical structures of the four compounds, astragaloside IV (AGS-IV), 6-O-β-D-glucopyranosyl cycloastragenol (6-O-β-D-glu CAG), 3-O-β-D-xylopyranosyl cycloastragenol (3-O-β-D-xyl CAG), cycloastragenol (CAG).
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