Neuroprotective Effects of (S)-N-[4-[4-[(3,4-Dihydro-6-hydroxy-2,5,7,8 -tetramethyl-2H-1-benzopyran-2-yl)carbonyl]-1-piperazinyl]phenyl]-2 -thiophenecarboximid-amide (BN 80933), an Inhibitor of Neuronal Nitric-Oxide Synthase and an Antioxidant, in Model of Transient Focal Cerebral Ischemia in Mice