Ethyl 3-methyl-4-nitro-2-(trifluoromethoxy)pyridine-5-carboxylate
5-(Difluoromethyl)-2-nitro-3-(trifluoromethoxy)pyridine-6-methanol
4-(Difluoromethyl)-2-nitro-6-(trifluoromethoxy)pyridine-3-methanol
3-(Difluoromethyl)-5-nitro-6-(trifluoromethoxy)pyridine-2-methanol