3-Cyano-2-hydroxy-5-(trifluoromethoxy)pyridine-4-sulfonyl chloride
6-Cyano-2-hydroxy-3-(trifluoromethoxy)pyridine-4-sulfonyl chloride
Methyl 3-cyano-6-hydroxy-2-(trifluoromethoxy)pyridine-5-carboxylate
2-Cyano-6-hydroxy-4-(trifluoromethoxy)pyridine-3-sulfonyl chloride