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