1-Phenyl-2-propanone oxime is a known in vitro metabolite of amphetamine. Further in vitro metabolism of this oxime with the 12,000g supernatant fraction from homogenized rat liver gave one major and two minor metabolites which were identified as 2-nitro-1-phenylpropane, benzyl alcohol, and 1-phenyl-2-propanone, respectively, by means of combined gas chromatography and mass spectrometry, and by comparison with authentic samples of each product.