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(a) Post-ion/ion reaction product ion spectrum from the m/z 812 precursor cation from a bovine liver extract with [PDPA − 2H]2−. (b) CID product ion spectrum of the [PC + PDPA − H]− complex with subsequent CID of the first generation [PC − CH3]− product. (c) CID product ion spectrum of the [PC + CH3COO−]− adduct formed via direct negative ionization.
