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Chemical structures of some of the phenolic compounds cited in this study. The plant compounds include coumarins and their glucosides (A), coumarin precursors and monolignols (B) and coumarinolignans derived from the coumarin fraxetin (C). The fraxetin moiety is highlighted in blue in the coumarinolignan structures. Compounds used as internal standards (D) include a methylenedioxy-coumarin and a lignan.
