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Four products of the in vitro oxidative metabolism of the piperidine ring of phencyclidine, 5-(1-phenylcyclohexylamino)valeraldehyde, V; N-(1-phenylcyclohexyl)-1,2,3,4-tetrahydropyridine, VIII; 5-(1-phenylcyclohexylamino)valeric acid, VII; and 1-phenylcyclohexylamine, IX, have been identified following derivatization, by GC/MS with stable isotope labeling and/or synthesis. The enamine, VIII, may be a work-up elimination product of a carbinolamine, alpha-hydroxy-N-(1-phenylcyclohexyl)piperidine, IV. The formation of all metabolites requires microsomal enzymes, but VII and the previously described N-(5-hydroxypentyl)-1-phenylcyclohexylamine, VI, also require soluble enzymes. Quantitative or semiquantitative data show that VI and VIII appear and disappear with time, whereas VII seems to be a terminal metabolite.
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