8-(3-methylbut-2-enyl)-1,4-dioxaspiro[4.5]dec-6-ene

4-(3-methylbut-2-enyl)cyclohex-3-en-1-one

4-(benzenesulfonyl)-4-(3-methylbut-2-enyl)cyclohex-2-en-1-one

ethyl 2-amino-5-methylhex-4-enoate

2,5-二甲基-4-己烯酸