Scheme 1.
Structure of chalcones: (a) 2′-hydroxy-4,4′,6′-trimethoxychalcone (HCH), (b) cardamonin (CA), (c) xanthohumol (XN), (d) isobavachalcone (IBC), and (e) licochalcone A (LIC) with the atom numbering.
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