ethyl 2,6,6-trimethylcyclohex-2-ene-1-carboxylate

1-methyl-2-(6-methylhept-5-en-2-yl)benzene

6-methylhept-5-en-1-yne

1,5-二甲基-1,4-环己二烯

6-bromo-2-methylhept-2-ene