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Omission of the xanthine oxidase substrate xanthine from the reaction mixture removes the source of reducing equivalents for the reduction of 1 by xanthine oxidase.
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15844367240
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unpublished data
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11 Poor cleavage by 3 may be due primarily to the fact that the compound is not efficiently reduced by the xanthine-xanthine oxidase enzyme system used in these studies (J S. Daniels, K. S. Gates, unpublished data); however, we suggest that the small amount of observed DNA cleavage by the mono-N-oxide 3 may proceed by a hydroxyl radical-liberating mechanism analogous to pathway a in Scheme 1
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30 however, the authors recognize that methanesulfinic acid could conceivably result from a direct reaction between radical 2 and DMSO.
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