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Identification of the chloramphenicol (Cm) hydrolysate. (A) Comparative analysis of the liquid chromatography-mass spectroscopy profile of purified Cm hydrolysate and p-nitrophenylserinol standard. (B and C) Proton nuclear magnetic resonance (1H-NMR) analysis of the Cm hydrolysate (B) and p-nitrophenylserinol standard (C).
