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(a) Post-ion/ion product ion spectrum from the reaction of the m/z 744 precursor cation from a bovine liver extract with [PDPA − 2H]2−. (b) CID product ion spectrum of the [PE − H]− ion generated by charge inversion. (c) CID product ion spectrum of the PDPA adduct ion generated by charge inversion with subsequent activation of the [PC − CH3]− product. (d) Product ion spectrum from CID of the acetate adducts generated via direct negative ionization.
