Ethyl 3,4-dihydroxy-5-(trifluoromethoxy)pyridine-2-acetate
Ethyl 4,5-dihydroxy-3-(trifluoromethoxy)pyridine-2-acetate
Ethyl 3,4-dihydroxy-2-(trifluoromethoxy)pyridine-6-acetate
Ethyl 3,4-dihydroxy-2-(trifluoromethoxy)pyridine-5-acetate
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