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