3-Cyano-6-hydroxy-4-(trifluoromethoxy)pyridine-2-acetonitrile
5-Cyano-2-hydroxy-3-(trifluoromethoxy)pyridine-4-acetonitrile
4-Cyano-5-hydroxy-3-(trifluoromethoxy)pyridine-2-acetonitrile
3-Fluoro-2-(difluoromethyl)-4-hydroxy-5-(trifluoromethoxy)pyridine