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