7,7,8,9,9-pentamethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione

螺双六氢嘧啶

3,3,4,4-tetramethylcyclopentan-1-one

2,2,5,5-tetramethylpyrrolidin-3-one

1,1,5-Trimethyl-3-(1,1,5-trimethyl-3-oxo-hex-4-enyl)-cyclohexa-1,3-dien