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Chromatograms of plasma and urine samples from rabbits showing selectivity of bioanalytical methods for quantification of BNZ. Panels: 1, plasma blank; 2, zero sample of plasma; 3, BNZ at 2.5 μg/ml in plasma; 4, urine blank; 5, zero sample of urine; 6, BNZ at 0.625 μg/ml in urine. I.S., internal standard (benzocaine); AU, absorbance units.
