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