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. Author manuscript; available in PMC: 2013 Nov 1.
Published in final edited form as: Anal Biochem. 2012 Jul 31;430(1):4–15. doi: 10.1016/j.ab.2012.07.022

Fig. 3.

Fig. 3

Fig. 3

Fig. 3

Fig. 3

Fig. 3

GC-MS (A) and GC-MS/MS spectra of the pentafluorobenzyl derivatives of AECK-DD (B, C, E) and 13C2-AECK-DD (D). Insets shows the proposed structures of the ions formed. P− indicates the respective precursor ion subjected to collision-induced dissociation.