after a single extraction of the drugs from serum , chlordiazepoxide , demoxepam , n-desmethyl-chloriazepoxide , diazepam , n-desmethyldiazepam , n-desalkylflurazepam , oxazepam , and prazepam can be resolved and quantified by using a c18 reversed-phase `` '' high-performance '' '' column and a ternary-solvent gradient system .
C0012010
diazepam
C0011279
desmethyldiazepam