Ethyl 5-(difluoromethyl)-3-nitro-2-(trifluoromethyl)pyridine-4-carboxylate
Methyl 3-(difluoromethyl)-6-nitro-2-(trifluoromethyl)pyridine-4-carboxylate
Ethyl 3-(difluoromethyl)-5-nitro-2-(trifluoromethyl)pyridine-6-carboxylate
Methyl 3-(difluoromethyl)-6-nitro-4-(trifluoromethyl)pyridine-2-carboxylate