1-甲基吡咯烷

3-羟基-1-甲基四氢吡咯

1-methyl-4-oxo-pyrrolidine-3-carboxylic acid ethyl ester, hydrochloride

1-乙基吡咯烷-3-酮

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