Representative chromatograms.

<p>(A) pure standard of 5 ng/ml N-desmethyl-olanzapine, 5 ng/ml olanzapine and 80 ng/ml clozapine dissolved in mobile phase without extraction; (B) pure standard of 20 ng/ml N-desmethyl-olanzapine, 20 ng/ml olanzapine and 80 ng/ml clozapine dissolved in mobile phase without extraction; (C) blank extracted plasma sample; (D) Extracted plasma sample spiked with 5 ng/ml N-desmethyl-olanzapine, 5 ng/ml olanzapine and 80 ng/ml clozapine; (E) Extracted plasma sample spiked with 20 ng/ml N-desmethyl-olanzapine, 20 ng/ml olanzapine and 80 ng/ml clozapine.