3-羟基哌啶

(2-oxopyrrolidin-1-yl)methyl (2S,5R,6R)-3,3-dimethyl-7-oxo-6-(2-phenylacetamido)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate

2-吡咯烷酮

甲醛

Proline, 2-methyl-5-oxo-, methyl ester