Methyl 4-(difluoromethyl)-6-nitro-3-(trifluoromethoxy)pyridine-2-carboxylate
Methyl 4-(difluoromethyl)-2-nitro-3-(trifluoromethoxy)pyridine-5-carboxylate
Ethyl 4-methyl-3-nitro-2-(trifluoromethoxy)pyridine-5-acetate
Methyl 5-(difluoromethyl)-3-nitro-4-(trifluoromethoxy)pyridine-2-carboxylate