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