1-(4-羟基-1,4-二甲基-3-哌啶)-乙酮

3-甲基-2,4-戊烷二酮

4,5,6-trimethyl-nicotinonitrile

3,4-dimethyl-5-oxo-hexanal

2-chloro-4,5,6-trimethylnicotinonitrile