3-苯基-5-羟基-1,2,4-噁二唑

4,5-Dihydro-5-oxo-3-phenyl-1,2,4-oxadiazol-4-essigsaeure-ethylester

2-苯基-5-噁唑酮

4-hydroxymethylidene-2-phenyl-4,5-dihydrooxazol-5-one