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  4,4'-Dipyridyl disulfide

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  4,2':5',4''-Terpyridine

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  (2E,2'E)-N,N'-(1,4-Phenylenebis(methylene))bis(3-(pyridin-4-yl)acrylamide)

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  Pyridine, 4,4'-(2,5-thiophenediyl)bis-