4,6-Dihydroxy-3-(trifluoromethoxy)pyridine-2-sulfonyl chloride
2,4-Dihydroxy-3-(trifluoromethoxy)pyridine-5-sulfonyl chloride
2,3-Dihydroxy-4-(trifluoromethoxy)pyridine-5-sulfonyl chloride
3-Amino-2-(fluoromethyl)-6-hydroxy-5-(trifluoromethoxy)pyridine