1. Amphetamine (AM) and five amphetamine derivatives, N-ethylamphetamine (NEA), N- butylamphetamine (NBA), 4-methoxyamphetamine (M-AM), 4-methoxy-Nethylamphetamine (M-NEA) and 4-methoxy-N-butylamphetamine (M-NBA) were incubated with microsomal preparations from cells expressing human CYP2D6 to determine whether the enzyme was capable of catalyzing the direct ring oxidation of all substrates; the N-dealkylation of NEA, ...