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  1h-pyrazolo[4,3-b]pyridine-6-carboxylic Acid

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  4,4′-Dihydroxy-2,2'-Bipyridine

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  5-Bromo-2,2'-Bipyridine

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  5-Hydroxy-2,2'-Bipyridine

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  4-Ethynylpyridine hydrochloride

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  Ethyl 4-pyrazolecarboxylate