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