2,6-二甲基-2,5-庚二烯-4-酮

7-azadispiro[5.1.5.3]hexadecan-15-one

2,2-dimethyl-1-azaspiro[5.5]undecan-4-one

四甲基哌啶酮

1,2,2,4,6,6-hexamethylpiperidin-4-ol