3-(Difluoromethyl)-2-nitro-6-(trifluoromethoxy)pyridine-5-acetonitrile
3-(Difluoromethyl)-4-nitro-6-(trifluoromethoxy)pyridine-2-acetonitrile
3-(Difluoromethyl)-2-nitro-5-(trifluoromethoxy)pyridine-4-acetonitrile
3-(Difluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine-6-acetonitrile