5-(Difluoromethyl)-2-hydroxy-3-nitro-4-(trifluoromethoxy)pyridine
4-(Chloromethyl)-2-hydroxy-5-methoxy-3-(trifluoromethoxy)pyridine
4-(Difluoromethyl)-5-hydroxy-3-nitro-2-(trifluoromethoxy)pyridine
3-(Chloromethyl)-5-fluoro-2-(trifluoromethoxy)pyridine-4-methanol