2-(Bromomethyl)-4-(difluoromethyl)-3-(trifluoromethoxy)pyridine-5-sulfonamide
2-(Bromomethyl)-3-(difluoromethyl)-5-(trifluoromethoxy)pyridine-6-sulfonamide
4-(Difluoromethyl)-5-methoxy-2-nitropyridine-3-sulfonamide
2-(Bromomethyl)-3-(difluoromethyl)-4-(trifluoromethoxy)pyridine-6-sulfonamide