ethyl 3-oxonon-8-enoate

diethyl 2-ethyl-2-pent-4-enylpropanedioate

hept-6-en-2-ol,4-methylbenzenesulfonic acid

1-pent-4-enyl-3-phenylpyrazin-2-one

1-(1-pent-4-enoxypentyl)-4-phenylbenzene