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