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