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