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(A–C) EPR kinetic profiles for the reaction of 200 and 400 µM nitrone solutions with 800 µM of PbO2-treated DPPH in benzene at 23 °C; (D) kinetic profiles for the reaction of nitrone 1 and PbO2-free DPPH at the same molar ratios (1:2 and 1:4); (E) DPPH signal growth as a function of time from freshly prepared solution in the presence of PbO2. Arrows indicate nitrone solution addition.
