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