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