2,6-二甲基-4-氧代-2-环己烯-1-羧酸乙酯

diethyl 2,4-dimethyl-6-oxocyclohex-4-ene-1,3-dicarboxylate

2-(2-哌啶乙基)吡啶

2-benzyl-1-ethenylbenzimidazole

1-ethenoxy-3-methylbutane