ethyl 1-(3-ethoxy-3-oxopropyl)piperidine-3-carboxylate

1-(2-bromoethyl)cyclopropan-1-ol

ethyl 3-[(2-ethoxy-2-oxoethyl)-methylamino]propanoate

ethyl 3-(2-oxo-1,3-benzothiazol-3-yl)propanoate

反式-2-戊烯酸