2,2,3,3-tetramethoxy-1-oxaspiro<3.5>non-5-ene

6-methylsulfanylcyclohex-2-en-1-one

(1R)-1-methylcyclohex-2-en-1-ol

3-(4-chlorobut-1-en-2-yl)cyclohexan-1-one

(5-羟基-1-环戊烯)-苯甲酮