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UV/vis spectra of PCMH (0.2 mg ml−1, pH 8.0). (A) Oxidized (straight line) and dithionite reduced (dotted line). (B) Oxidized (straight line) and p-cresol reduced (1 mM, 15 min, dotted line). (C) Oxidized (straight line) and p-hydroxybenzaldehyde reduced (1 mM, 15 min, dotted line). Insets in panels A to C show difference spectra (reduced value minus oxidized value).
