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(−)-(9 S)-9-(3-Bromo-4-fluorophenyl)-2,3,5,6,7,9-hexahydrothieno[3,2-b]quinolin-8(4 H)-one 1,1-Dioxide (A-278637): A Novel ATP-Sensitive Potassium Channel Opener Efficacious in Suppressing Urinary Bladder Contractions. I. In Vitro Characterization