1,3,4-OXADIAZOLE, 2-5-DIPHENYL- 2,5-Diphenyl-1,3,4-oxadiazole 2,5-Diphenyloxadiazole 4-27-00-07212 (Beilstein Handbook Reference) 725-12-2 BRN 0170385 EINECS 211-968-0 NSC 53152 PPD