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The product-ion spectra of the [M + Li]+ ions of a16:0/18:1-PC at m/z 752 (A), p16:0/18:1-PC at m/z 750 (B), lyso1/18:1-PC at m/z 528 (C), and of 18:1/lyso2-PC at m/z 528 (D), a16:0/lyso2-PC at m/z 488 (E), and of p16:0/lyso2-PC at m/z 486 (F).