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