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Mass spectrometric characterization of SPHA/nitroso adducts. A, Putative scheme of derivation of reactive hydroxylamine and nitroso metabolites from parent drug SP and all possible downstream adducts with glutathione. B, Mass spectrometric confirmation of glutathione adducts, MS/MS spectra depict the formation of sulfinamide (m/z 571), N-hydroxysulfinamide and sulfonamide (m/z 587), and N-hydroxysulfonamide (m/z 603) adducts.
