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Chemical structures of glycyrrhizic acid (GL) and its derivatives. They include two isomers of glycyrrhizic acid, namely, (a) 18α-glycyrrhizic acid (18α-GL) and (b) 18β-glycyrrhizic acid (18β-GL); two isomers of glycyrrhetinic acid (GA), namely, (c) 18α-glycyrrhetinic acid (18α-GA) and (d) 18β-glycyrrhetinic acid (18β-GA); (e) ammonium glycyrrhizinate (AG); and (f) diammonium glycyrrhizinate (DG).
