5-Hydroxy-2-nitro-3-(trifluoromethoxy)pyridine-6-sulfonyl chloride
4-(Chloromethyl)-3-hydroxy-6-methoxy-2-(trifluoromethoxy)pyridine
4-(Chloromethyl)-3-hydroxy-2-methoxy-6-(trifluoromethoxy)pyridine
4-Hydroxy-3-nitro-6-(trifluoromethoxy)pyridine-2-sulfonyl chloride