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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2011 Mar 22;22(5):912–921. doi: 10.1007/s13361-011-0103-2

Scheme 2.

Scheme 2

Sequence of events in the ion/ion reaction between polypeptide cation(s) and a sulfo-NHS-based reagent anion leading to: (a) intra-molecularly cross-linked peptide and (b) inter-molecularly cross-linked peptides in the gas phase.