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