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