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. Author manuscript; available in PMC: 2014 May 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2013 Mar 5;24(5):733–743. doi: 10.1007/s13361-013-0590-4

Figure 3.

Figure 3

(a) CID of [M+7H + sulfo-NHS-AMCA – sulfo-NHS]6+. +AMCA indicates the covalent attachment of AMCA to the fragment ion. (b) Structure of sulfo-NHS-AMCA.