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