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Changes in the level of OH radical adduct of CYPMPO as a function of the concentration of the antioxidant N-acetylcysteine (NAC). Five-second in situ UV photolysis was carried out to the sodium phosphate buffer (50 mM) solution of H2O2 (10 mM) and CYPMPO (10 mM). The peak-to-peak intensity of the line marked with * was adopted as I0 or I to calculate relative OH radical scavenging rates.
