(R)-(-)-5-羟甲基-2-吡咯烷酮

tert-butyl (4R,4'R,5'S)-4-amino-5-(3',4'-dimethyl-2'-oxo-5'-phenyl-1'-imidazolydinyl)-5-oxopentanoate

(R)-2-吡咯烷酮-5-甲酸甲酯

D-谷氨酸

D-焦谷氨酸乙酯