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