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