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The metabolites of 1-[bis(4-fluorophenyl)methyl]-4-(2,3,4-trimethoxybenzyl)piperazine dihydrochloride (KB-2796) in the bile, urine and feces in rats were investigated after oral administration of [methine-14C], [benzyl-14C] and unlabelled KB-2796. Their structures were characterized by thin-layer chromatography, mass spectrometry, proton nuclear magnetic resonance and comparison with synthesized authentic compounds. The main pathways of biotransformation of KB-2796 in rats were: (a) O-demethylation at each methoxy group of the trimethoxybenzyl moiety, (b) N-dealkylation at 1 and 4-position of the piperazine ring and (c) hydroxylation at 5-position of the 2,3,4-trimethoxyphenyl ring.

journal of pharmacobio-dynamics

Isolation and Identification of the New Metabolites of 1-(Bis(4-fluorophenyl)methyl)-4-(2,3,4-trimethoxybenzyl)piperazine Dihydrochloride (KB-2796) from Rat Bile, Urine and Feces.