叔丁基丙二酰胺

3-O-tert-butyl 1-O-ethyl 2-methylpropanedioate

1-(乙氧基羰基)环己烷羧酸

1-ethoxycarbonylcyclopentane-1-carboxylate

4-(4-氯苯基)-3-氧代丁酸乙酯