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Schematic diagram indicating the important fragmentation paths for fragmentation of KNI-272 after MS/MS analysis that allowed us to assign the sites of oxidation. Path a provides information for the determination of the oxidation state of the thioproline. Path b provides information for the determination of the oxidation state of the S-methyl cysteine. Numbers in parentheses represent the expected molecular weights if the sulfur in the fragment is oxidized.
