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