3-(Difluoromethyl)-5-nitro-2-(trifluoromethoxy)pyridine-4-sulfonamide
3-(Difluoromethyl)-5-nitro-6-(trifluoromethoxy)pyridine-2-sulfonamide
6-(Difluoromethyl)-4-nitro-3-(trifluoromethoxy)pyridine-2-sulfonamide
3-(Difluoromethyl)-4-nitro-6-(trifluoromethoxy)pyridine-2-sulfonamide