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