3-phenyl-1,4-dioxa-2-azaspiro[4.6]undec-2-ene

3-phenyl-1,4-dioxa-2-azaspiro[4.4]non-2-ene

5-ethyl-5-methyl-3-phenyl-<1,4,2>-dioxazole

三苯基恶唑

N-Benzoyl-2-(4'-chlorophenyl)-4,5-dimethyl-1,2,3-triazol-1-imine