4-(Difluoromethyl)-2-nitro-3-(trifluoromethoxy)pyridine-6-carboxylic acid
5-Nitro-2-(trifluoromethoxy)-3-(trifluoromethyl)pyridine-4-sulfonamide
4-Nitro-3-(trifluoromethoxy)-2-(trifluoromethyl)pyridine-5-sulfonamide
3-Nitro-5-(trifluoromethoxy)-2-(trifluoromethyl)pyridine-4-sulfonamide