but-2-enyl but-2-enoate

1,1-双(三甲基甲硅烷基氧基)-1,3-丁二烯

N-benzylbut-2-enamide

[(2,3-dimethyl-4-oxocyclohexa-2,5-dien-1-ylidene)amino] 3,5-dinitrobenzoate

3-(2-hydroxyethylamino)butanoic acid