3-(Difluoromethyl)-2-hydroxy-5-nitro-6-(trifluoromethoxy)pyridine
3-(Chloromethyl)-4-hydroxy-5-methoxy-2-(trifluoromethoxy)pyridine
3-(Difluoromethyl)-2-hydroxy-4-nitro-5-(trifluoromethoxy)pyridine
6-(Chloromethyl)-3-fluoro-4-(trifluoromethoxy)pyridine-2-methanol