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