<chemical> 4-amino-n-(6-chloro-3-pyridazinyl)benzenesulfonamide. A sulfonamide antimicrobial used for urinary tract infections and in veterinary medicine. ... Pharmacological action: anti-infective agents, anti-infective agents, urinary. ... Chemical name: Benzenesulfonamide, 4-amino-N-(6-chloro-3-pyridazinyl)- ... (12 Dec 1998) ...