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