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LC/ESI-MS/MS analysis of rat urine for NAC-BDA-spermidine cross-links. Animals were treated with either corn oil alone or corn oil containing [12C4]- or [13C4]furan. A. The traces were generated by monitoring for the neutral loss of 71 from the molecular ion ([12C4]: m/z 357 → m/z 286; [13C4]: m/z 361 → m/z 290). B. The traces were generated by monitoring for the neutral loss of 129 from the molecular ion ([12C4]: m/z 357 → m/z 228; [13C4]: m/z 361 → m/z 232).
