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