diethyl 2-but-3-en-2-yl-2-methylpropanedioate

diethyl ((Z)-2-butene-1-yl)methylmalonate

ethyl 2-methyl-2-carboethoxy-trans-4-hexenoate

庚-5-烯-2-酮

1-but-2-enylsulfonyl-4-methylbenzene