methyl 3-((3S,5S)-3-cyano-5-isopropyl-6-oxomorpholin-3-yl)propanoate

dimethyl (E,2R)-2-(tert-butyldimethylsilyloxymethyl)-2-(methoxycarbonylamino)pentanedioate

methyl 5-bromo-4-oxopentanoate

5-hydroxy-4-oxopentanoic acid methyl ester

4-oxo-5-phenylmethoxypentanoic acid