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