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