1,3,4-Oxadiazole, 2,5-(o-hydroxyphenyl)- 2491-96-5 Phenol, 2,2'-(1,3,4-oxadiazole-2,5-diyl)bis- Phenol, o,o'-(1,3,4-oxadiazol-2,5-ylene)di- o,o'-(1,3,4-Oxadiazol-2,5-ylene)diphenol