after extraction of thiotepa and its metabolite , triethylenephosphoramide ( tepa ) , from plasma using sep-pak c18 cartridges , the compounds were separated by capillary chromatography , detected using a nitrogen detector and quantified by reference to an internal standard , hexaethylphosphoramide .
C0039871
thiotepa
C0039533
triethylenephosphoramide