Representative HPLC/MS chromatograms obtained by APCI at selected ion currents of [MH]+ ions of 3-OHCBZ or 2-OHCBZ and their respective metabolites formed by human liver microsomes. T.I.C., total ion count; 1, proposed 2,3-diOHCBZ metabolite (24.5 min); 2–5, unidentified metabolites of 3-OHCBZ (29.5 min); X, unidentified contaminant: IS, (CBZ, 29.5 min); 2-OHIS, 2hydroxyiminostilbene (28.5 min).