2,2'-Dipyridylglyoxal bis(2-picolylimine);N,N'-(1,2-Di-2-pyridinyl-1,2-ethanediylidene)bis(2-pyridinemethanamine);N,N'-Bis[(pyridin-2-yl)methyl]-1,2-bis(2-pyridyl)-1,2-ethanediimine
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