1,2-Bis(4-pyridyl)ethylene 1,2-Di(4-pyridyl)ethylene 1,2-Di-4-pyridylethene 1135-32-6 4,4'-Vinylenedipyridine 4-(4-Pyridylvinyl)pyridine AI3-61802 EINECS 214-491-6 NSC 11470 Pyridine, 4,4'-(1,2-ethenediyl)bis- Pyridine, 4,4'-vinylenedi- (8CI)