Ethyl 3-cyano-2-hydroxy-4-(trifluoromethoxy)pyridine-6-carboxylate
Ethyl 2-cyano-6-hydroxy-5-(trifluoromethoxy)pyridine-3-carboxylate
4-Chloro-3-methyl-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride
Ethyl 2-cyano-6-hydroxy-3-(trifluoromethoxy)pyridine-5-carboxylate