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