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Five (
2a–e
) benzenesulfonylurea derivatives bearing pyridazinone were synthesized by refluxing the appropriate 6-aryl-2-(p-sulfamylphenyl)-4,5-dihydropyridazine-3(2H)-one with benzylisocyanate in dry acetone over anhydrous K
2
CO
3
. These compounds were characterized by elemental analysis and various spectroscopic techniques viz; IR,
1
H NMR,
13
C NMR, and MS data. These compounds (
2a–e
) at the dose of 20 mg/kg were tested for blood glucose lowering activity in glucose-fed hyperglycemic normal rats. Compound
2b
showed more potent anti-hyperglycemic activity than the standard drug gliclazide. The compound
2b
was also tested for its hypoglycemic effect in fasted normal rats. It also showed significant hypoglycemic effect (but less than that of gliclazide).