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. Author manuscript; available in PMC: 2009 Apr 30.
Published in final edited form as: Anal Biochem. 2007 Nov 28;375(1):105–114. doi: 10.1016/j.ab.2007.11.028

Fig. 4.

Fig. 4

LC-ESI-MS/MS product ion spectra of the [M+H]+ ions of the PS derivatives of E1, EE2, EQ, and EQN. The [M+H]+ ions of the PS derivatives of (A) E1, (B) EE2, (C) EQ, and (D) EQN at m/z 412, 438, 408, and 410, respectively, were collisionally activated at 40 eV, and the resulting product ion spectra are shown.