4,4'-bipyridine CHEBI:30985 4,4'-dipyridine 4-(4-pyridyl)pyridine 4,4'-bipyridyl gamma,gamma'-dipyridyl 4,4'-dipyridyl chebi_ontology 4,4-Bipyridin gamma,gamma'-bipyridyl 4,4'-bpy A bipyridine in which the two pyridine moieties are linked by a bond between positions C-4 and C-4'. bipyridine