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