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. Author manuscript; available in PMC: 2014 Jan 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2012 Dec 4;24(1):30–37. doi: 10.1007/s13361-012-0506-8

Scheme 1.

Scheme 1

Sequence of events in the ion/ion reaction between a multiply deprotonated analyte and fixed charge CMC cation resulting in the gas-phase covalent modification of the analyte at a carboxylic acid functional group.