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