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Representative chromatograms for ZYRTEC® 10 mg·mL−1 oral drops (on the left) and for ZYRTEC® 1 mg·mL−1 oral solution (on the right); (A) cetirizine enantiomers and moclobemide as an internal standard (Step II of the two-step liquid-liquid extraction procedure); (B) M and P parabens with moclobemide as an internal standard (Step I of the two-step liquid-liquid extraction procedure).
