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