1,3,4-Oxadiazole, 2,5-di-3-pyridyl- 15420-57-2 3,3'-(1,3,4-Oxadiazol-2,5-ylene)dipyridine Pyridine, 3,3'-(1,3,4-oxadiazol-2,5-ylene)di- Pyridine, 3,3'-(1,3,4-oxadiazole-2,5-diyl)bis-