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