4-Cyano-6-hydroxy-2-(trifluoromethoxy)pyridine-3-carbonyl chloride
3-Cyano-2-iodo-5-(trifluoromethoxy)pyridine-6-carbonyl chloride
6-Cyano-3-hydroxy-2-(trifluoromethoxy)pyridine-4-carbonyl chloride
4-Cyano-2-hydroxy-6-(trifluoromethoxy)pyridine-3-carbonyl chloride