4-fluoro-3-methyl-N-[[4-(1-oxidopyridin-1-ium-2-yl)piperidin-1-yl]methyl]benzamide 4-fluoro-3-methyl-N-[[4-(1-oxidopyridin-1-ium-2-yl)-1-piperidyl]methyl]benzamide 4-fluoro-3-methyl-N-[[4-(1-oxido-2-pyridin-1-iumyl)-1-piperidinyl]methyl]benzamide