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