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