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