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The production mass spectra of abundant protonated molecular ions ([M+H]+) for levofloxacin and ciprofloxacin. (A) Fragment ions of mass-to-charge ratio (m/z) 362.0 → 318.1 were chosen as the production for monitoring levofloxacin and (B) fragment ions of m/z 332.2 → 314.0 were chosen for ciprofloxacin.
