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HRAMS/MS spectra of co-eluted HCAs showing diagnostic fragment ions. (A) Tandem MS/MS mass spectra of IQ (B) Tandem MS/MS mass spectra of MeIQx. IQ = 2-amino-3-methylimidazo[4,5-f]quinolone. MeIQx = 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline. M = Exact mass of fragment ion. HCA = Heterocyclic amine.
