1,3,4-Oxadiazole, 2,5-di-2-pyridyl- 1671-89-2 2,2'-(1,3,4-Oxadiazol-2,5-ylene)dipyridine Pyridine, 2,2'-(1,3,4-oxadiazol-2,5-ylene)di- Pyridine, 2,2'-(1,3,4-oxadiazole-2,5-diyl)bis-