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Xenobiotica
the fate of foreign compounds in biological systems
Volume 11, 1981 - Issue 4
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Research Article

3-(2,6-Xylyl)-5-methylhydantoin—a metabolite or a metabonate of tocainide in rats?

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Pages 259-265 | Received 12 Aug 1980, Published online: 22 Sep 2008
 

Abstract

1. G.l.c.-mass spectrometric analysis of urine extracts from rats dosed with tocainide (I) revealed the presence of a cyclic compound identified as 3-(2,6-xylyl)-5-methylhydantoin (IV) derived from tocainide.

2. Evidence indicates that IV is derived from a conjugate of tocainide (tocainide carbonyl O-β-D-glucuronide) (III) in humans.

3. Results of the present study indicate that in addition to being formed from a conjugate, IV is generated directly from tocainide in vivo in rats. Possible mechanisms for the formation of IV in rats in vivo are discussed.

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