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4,4'-DIBROMO-2,2'-BIPYRIDINE 2,2':6',2''-TERPYRIDINE-4'-CARBOXYLIC ACID 4,4'-BIS(DIHYDROXYPHOSPHORYL)-2,2'-BIPYRIDINE 2,2':6',2''-TERPYRIDINE-4'-CARBALDEHYDE 2,6-BIS(2-PYRIDYL)-4(1H)-PYRIDONE 6,6'-Dimethyl-2,2'-dipyridyl 4,4'-Bis(hydroxymethyl)-2,2'-bipyridine DIETHYL 2,2'-BIPYRIDINE-6,6'-DICARBOXYLATE