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Oxidative modification of the phosphonucleotide moiety and the corrin ring of Cobl. Extracted ion chromatogram (A & B) and MS spectrum (C) of oxidatively modified phosphonucleotide moiety and corrin degradation product, detected from the Cobl-HOCl reaction mixture. The molecular ion was detected in the [M+H]+ form and had a m/z of 279 and 579. The assigned structures of m/z 279 and 579 are shown in D & E.
