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