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LC-MS analysis of the reaction mixture generated by anaerobic metabolism of 6 (0.8 mM) by xanthine oxidase (2.4 U/mL) and xanthine (6.4 mM). The enzymatic reduction of 1 was carried out as described in the Experimental Section. Panel A: HPLC trace of the reaction mixture monitoring absorbance at 254 nm, Panel B: LC-MS spectrum of the product eluting at 4.70 min, Panel C: LC-MS spectrum of the product eluting at 19.20 min.
