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Four chalcone compounds. (A) Isoliquiritigenin (2′,4′,4-trihydroxychalcone; ISL) is a flavonoid found in licorice. (B) Licochalcone A (LCA) is a characteristic chalcone that is found in licorice. (C) Bavachalcone (BC) is a substance with a 2′-HC core structure. (D) 2′-HC is the monomeric compound discussed in this paper.
