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Abstract

Stereoselective renal tubular secretion of a new uricosuric diuretic, 6,7-dichloro-5-(N,N-dimethylsulfamoyl)-2,3-dihydro-2-benzofurancarboxyl ic acid (S-8666), in cynomolgus monkeys.

M Nakano and S Kawahara
Drug Metabolism and Disposition March 1992, 20 (2) 179-185;
M Nakano
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Abstract

Plasma concentration-time curves and urinary excretion of individual enantiomers of unchanged S-8666 and its N-monodemethylated metabolite, M-1, in male cynomolgus monkeys were measured after oral administration of racemic S-8666 at doses of 5, 10, and 50 mg/kg and also after intravenous injection at doses of 1, 5, and 10 mg/kg. The Tmax values for individual enantiomers of S-8666 in fasted male monkeys were 30 min after oral administration. The AUC values for S(-)-S-8666 were greater than those for R(+)-S-8666 and oral dose-AUC relationships of both enantiomers showed a linearity over the dose range used. Most of the S-8666 and a trace of M-1 were excreted in the first 24-hr urine, with no evidence of stereoselectivity from the amounts excreted. Since large portions were recovered from the urine as unchanged S-8666 after intravenous injection, most excretion occurs via the kidney. The t1/2 beta values and the Vdss for S(-)-S-8666 after intravenous injection were smaller than those for R(+)-S-8666. The CLt and the CLr values decreased with increasing intravenous doses, indicating saturation at a renal excretion process at high plasma concentrations of S-8666. The CLt and CLr values for R(+)-S-8666 were greater than those for the S(-)-enantiomer. The unbound fraction of R(+)-S-8666 in plasma was significantly greater than that of S(-)-S-8666 [21.6% for R(+), 12.0% for S(-)]. Renal clearance for the unbound fraction of S(-)-S-8666 was greater than that of R(+)-S-8666, suggesting stereoselective renal tubular secretion.

 

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Drug Metabolism and Disposition
Vol. 20, Issue 2
1 Mar 1992
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Stereoselective renal tubular secretion of a new uricosuric diuretic, 6,7-dichloro-5-(N,N-dimethylsulfamoyl)-2,3-dihydro-2-benzofurancarboxyl ic acid (S-8666), in cynomolgus monkeys.
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Abstract

Stereoselective renal tubular secretion of a new uricosuric diuretic, 6,7-dichloro-5-(N,N-dimethylsulfamoyl)-2,3-dihydro-2-benzofurancarboxyl ic acid (S-8666), in cynomolgus monkeys.

M Nakano and S Kawahara
Drug Metabolism and Disposition March 1, 1992, 20 (2) 179-185;

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Abstract

Stereoselective renal tubular secretion of a new uricosuric diuretic, 6,7-dichloro-5-(N,N-dimethylsulfamoyl)-2,3-dihydro-2-benzofurancarboxyl ic acid (S-8666), in cynomolgus monkeys.

M Nakano and S Kawahara
Drug Metabolism and Disposition March 1, 1992, 20 (2) 179-185;
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