... chromatograms of triazolam, 4-hydroxytriazolam, α-hydroxytriazolam and alprazolam (IS) A 100-ng aliquot each of triazolam, 4-hydroxytriazolam and α-hydroxytriazolam and 50 ng of alprazolam were added ... 4-hydroxytriazolam and α-hydroxytriazolam in plasma and urine The quantitativeness could be observed in the range of 50–400 ng/mL for all compounds in both plasma and urine Toxic and fatal concentrations ... oxazolam, cloxazolam, mexazolam, flutazolam and haloxazolam having oxazolo rings in their structures [1] In such cases, the relatively low injection temperature and the use of a wide-bore capillary...