2-Hydroxy-4-nitro-5-(trifluoromethoxy)pyridine-3-carboxylic acid
2-Hydroxy-6-nitro-3-(trifluoromethoxy)pyridine-4-carboxylic acid
5-(Difluoromethyl)-3-hydroxy-4-(trifluoromethoxy)-2-(trifluoromethyl)pyridine
2-Hydroxy-3-nitro-6-(trifluoromethoxy)pyridine-5-carboxylic acid