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Chemical structures of the 10 phenolic compounds (a to j) selected in the mediator screening (Fig. 1) and of 7 synthetic mediators and HAA (k to r). (a) Acetosyringone; (b) syringaldehyde; (c) 2,6-dimethylphenol; (d) 2,4,6-trimethoxyphenol; (e) ethyl vanillin; (f) acetovanillone; (g) vanillin; (h) vanillyl alcohol; (i) methyl vanillate; (j) p-coumaric acid; (k) ABTS; (l) HBT; (m) VIO; (n) TEMPO; (o) HNNS; (p) NNDS; (q) PZ; (r) HAA.
