5-Chloro-2,4-dihydroxy-3-(trifluoromethoxy)pyridine
4-(Difluoromethyl)-3-nitro-5-(trifluoromethoxy)pyridine
3,4-Dihydroxy-2-methyl-6-(trifluoromethoxy)pyridine
3-(Difluoromethyl)-5-nitro-4-(trifluoromethoxy)pyridine
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