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Absorption spectra for solutions of radicals acquired by rapid scan at 250 MHz. A) 0.5 mM I, B) 1 mM Ia, C) 0.5 mM II, and D) 1 mM IIa. Lines are numbered from low to high field. Ia and IIa were prepared by reaction of I (0.5 mM) or II (0.5 mM), respectively, with a two-fold excess of glutathione (1 mM).
