1,2-Bis(4-pyridyl)ethylene 1,2-Di-4-pyridylethene 1135-32-6 4,4'-Vinylenedipyridine 4-(4-Pyridylvinyl)pyridine NSC11470 Pyridine, 4,4'-(1,2-ethenediyl)bis- Pyridine, 4,4'-vinylenedi- WLN: T6NJ D1U1- DT6NJ