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