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