(−)-(9S)-9-(3-Bromo-4-fluorophenyl)-2,3,5,6,7,9-hexahydrothieno[3,2-b]quinolin-8(4H)-one 1,1-dioxide (A-278637), a Novel ATP-Sensitive Potassium Channel Opener: Hemodynamic Comparison to ZD-6169, WAY-133537, and Nifedipine in the Anesthetized Canine