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The MS2 spectrum of the [M – H]− ions of t18:0/20:0-Cer at m/z 610 (a), its MS3 spectrum of the ions of m/z 592 (610 → 592) (b); and the MS2 spectrum of the [M - H]− ions of t18:0/h20:0-Cer at m/z 626 (c), its MS3 spectrum of the ions at m/z 327 (626 → 327) (d).
