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Different mechanistic proposals for the two major types of eliminations of the phosphopantetheinyl functionality during tandem mass spectrometry to generate the ejection ions with a charge of 1+. R = H or acyl substituent. z = charge. In A and B we show that the amide on the right side of the 1+ ejection ion is protonated, it is also possible that the other amide is protonated (37).
