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