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