3-(Difluoromethyl)-5-nitro-4-(trifluoromethoxy)pyridine-2-carboxylic acid
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