5,5-dimethyl-2-phenylpyrazolidin-3-one

3,3,5,7-四甲基-1-茚满酮

2,2-dimethyl-4,5-dihydro-3H-1,5-benzothiazepine

2,2,8-trimethyl-4-chromanone

4,4,8-三甲基苯并二氢吡喃-2-酮