2-(2-丙炔-1-基)丙二酸二乙酯

diethyl 2-pent-1-enyl-2-prop-1-ynylpropanedioate

diethyl 2-(4-methylpent-2-enyl)-2-prop-1-ynylpropanedioate

ethyl 2-prop-2-ynylhept-4-enoate

ethyl 6-methyl-2-prop-2-ynylhept-4-enoate