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