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General scheme of possible transformations of celosianin 17 during ABTS cation radical oxidation, leading to the generation of xan-derivatives: 2-decarboxy-xanneocelosianin 22, 2,17-bidecarboxy-xancelosianin 19, and 2,17-bidecarboxy-xanneocelosianin 20. The same mechanism is proposed for the oxidation of amaranthin and argentianin.
