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