a specific analytical procedure for the quantitation of amphetamine ( i ) , norephedrine ( iii ) , and their amphoteric metabolites , p-hydroxy-amphetamine ( ii ) and p-hydroxynorephedrine ( iv ) , in biological samples using electron-capture gas chromatography ( gc-ec ) is described .
C0031495
norephedrine
C0030141
p-hydroxynorephedrine