5-acetoxy-3-phenyl-4,5-dihydro-isoxazole

5,5-dimethyl-3-methylidenepyrrolidin-2-one

3-phenyl-6-oxo-8,8-dimethyl-1-oxa-2,7-diazaspiro<4.4>non-2-ene

3,4-二苯基异恶唑

3,5-二苯基异噁唑