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Fluorogenic hydroxylamine reagents were used for detecting 5-fC through a labeling pathway. Chemical synthesis, HPLC, denaturing PAGE, and DNA MS were applied to testify that the probe reacted with 5-fC with oligodeoxynucleotide selectivity to achieve 5-fC detection conveniently and quantificationally with the method of fluorescence. The feasibility of fluorescently detecting 5-fC in a genome was also investigated.