4-Cyano-2-hydroxy-3-(trifluoromethoxy)pyridine-5-carboxylic acid
5-Chloro-2-(chloromethyl)-4-hydroxy-3-(trifluoromethoxy)pyridine
4-Chloro-6-methyl-2-(trifluoromethoxy)pyridine-3-carboxylic acid
4-Chloro-5-(chloromethyl)-2-hydroxy-3-(trifluoromethoxy)pyridine