3,3-二甲基-四氢-吡喃-2-酮

1-methoxy-2-methyl-4-(1,2,2-trimethylcyclopentyl)benzene

2,2-二甲基-4-氧代戊醛

4,4-dimethylhept-6-enal

2-甲-4-戊烯-2-醇